WO2016187821A1

WO2016187821A1 - Method, device, and system for adjusting packet length in near field communication (nfc)

Info

Publication number: WO2016187821A1
Application number: PCT/CN2015/079847
Authority: WO
Inventors: 赵晓娜; 常新苗
Original assignee: 华为技术有限公司
Priority date: 2015-05-26
Filing date: 2015-05-26
Publication date: 2016-12-01
Also published as: US11166137B2; KR102256450B1; EP3297176B1; CN106605371A; JP6564070B2; JP2018523358A; EP3297176A4; CN106605371B; KR20180011233A; US10470019B2; EP3297176A1; US20180132089A1; KR102085175B1; KR20200023558A; US20200045523A1

Abstract

Disclosed are a method, device, and system for adjusting packet length in near field communication (NFC). The method comprises: an NFCC of a first NFC device determines whether or not self is responsible for determining the maximum length value of packets to be transmitted in subsequent communication; if yes, then a first request comprising a first length value is transmitted to a second NFC device, where the first request is used for indicating that the maximum length value of packets to be transmitted in subsequent communication between the first NFC device and the second NFC device be adjusted to the first length value, the first length value is one value determined by the NFCC, and the first request also comprises a first DID; and a first response returned by the second NFC device with respect to the first request and comprising a second DID is received, when the first DID is identical to the second DID, the first length value is used as the maximum length value of packets to be transmitted in subsequent communication. This shows that implementation of embodiments of the present invention allows by means of NCI specifications the implementation of the function for an NFCC and an NFC device serving as a target side to adjust the maximum length value of communication packets in subsequent communication.

Description

Method, device and system for adjusting data packet length in near field communication NFC

Technical field

The present invention relates to the field of near field communication (NFC) technology, and in particular, to a method, device and system for adjusting the length of a data packet in a near field communication NFC.

Background technique

NFC technology is a short-range wireless connection technology that can realize close-range communication between NFC-enabled electronic devices (also known as "NFC devices") by magnetic field induction, and the NFC device mainly includes three functional entities: a host (DH) , Device Host), NFC Controller (NFCC, NFC Controller) and NFC Execution Environment (NFCEE, NFC Execution Environment). In the NFC technology, the NFC Controller Interface (NCI) interface mainly defines a logical interface for implementing communication between DH and NFCC in an NFC device, and two are implemented in a Peer-to-Peer (P2P) mode. The NFC device for communication is subject to the NFC-Data Exchange Protocol (NFC-DEP).

The Digital Specification developed by the NFC Forum (the full name of the NFC Digital Protocol Specification) stipulates that two NFC devices that perform point-to-point communication can pass the attribute request (ATR_REQ, Attribute Request) before communicating through the NFC-DEP protocol. The attribute response (ATR_RES, Attribute Response) negotiates the maximum length values LR _I and LR _T of the data packets transmitted during the subsequent communication, wherein the LR _{I is set} by the NFC device as an initiator and is used as a target The length of the data packet transmitted by the (target) NFC device, the LR _T is set by the NFC device as the target and is used to limit the length of the data packet transmitted by the NFC device as the initiator. Then, the NFC device as the initiator can also adjust the maximum length value LR of the data packet transmitted in the subsequent communication process with the NFC device as the target through the parameter selection request (PSL_REQ, Parameter Selection Request), where LR is less than or equal to LR. _I and LR _T , LR, are methods for negotiating the length of a communication packet between two NFC chips.

The NCI protocol is used to specify how parameters, commands, etc. are used when the NFC chip communicates with the NFC chip on the opposite end. Currently, the NCI protocol does not give a guide to how the NFC chip uses the PSL_REQ defined by the Digital protocol to adjust the maximum length value LR of packets transmitted during subsequent communication. Features.

Summary of the invention

The embodiment of the invention discloses a method, device and system for adjusting the length of a data packet in a near field communication NFC, which can realize the adjustment of the first NFC device as the initiator through the NCI specification and the second NFC device as the target by the NCI specification. The function of the maximum length value of packets transmitted during subsequent communications.

A first aspect of the embodiments of the present invention discloses a method for adjusting a data packet length in a near field communication NFC, where the method includes:

The NFCC of the first NFC device determines whether the NFCC is responsible for determining the maximum length value of the data packet transmitted in the subsequent communication;

If the NFCC is responsible for determining the maximum length value of the data packet transmitted in the subsequent communication, the NFCC sends a first request including the first length value to the second NFC device, the first request is used to indicate that The maximum length value of the data packet transmitted by the first NFC device and the second NFC device in the subsequent communication is adjusted to the first length value, and the first request further includes a first device identifier DID, where The first length value is a value determined by the NFCC;

The NFCC receives a first response returned by the second NFC device for the first request, and the first response includes a second DID;

If the first DID is the same as the second DID, the NFCC uses the first length value as the maximum length value of the data packet transmitted in the subsequent communication.

In a first possible implementation manner of the first aspect of the embodiment, the determining, by the NFCC, is determining, by the NFCC, a maximum length value of the data packet transmitted in the subsequent communication, including:

Determining whether the value of the first parameter is a first specific value, wherein the first specific value is used to indicate that a maximum length value of the data packet transmitted in the subsequent communication is determined by the NFCC, wherein the value of the first parameter Is the default value of the NFCC, or the value assigned to the NFCC by the DH of the first device.

With reference to the first aspect of the embodiments of the present invention, in a second possible implementation manner of the first aspect of the embodiments, the method further includes:

Transmitting, by the NFCC, a first notification that includes the first length value to a DH of the first NFC device, where the first notification is used to notify that the DH first radio frequency RF interface has been activated;

Receiving, by the NFCC, the data message sent by the DH by using the first RF interface, and encapsulating the load in the data message into a data packet by using the first length value as the maximum length value;

The NFCC sends the data packet to the second NFC device.

With reference to the first possible implementation manner of the first aspect of the embodiments of the present invention, in a third possible implementation manner of the first aspect of the embodiments, the method further includes:

The NFCC sends a first notification including the first length value to the DH, where the first notification is used to notify the DH that the first radio frequency RF interface has been activated;

The NFCC sends the data packet to the second NFC device.

With reference to the first aspect of the embodiments of the present invention, the first possible implementation manner of the first aspect of the embodiment of the present invention, the second possible implementation manner of the first aspect of the embodiment of the present invention, or the first aspect of the first aspect of the embodiment of the present invention In a fourth possible implementation manner of the first aspect of the embodiments, the method further includes:

If the NFCC is not responsible for determining the maximum length value of the data packet transmitted in the subsequent communication, the NFCC does not send the first request including the first length value to the second NFC device.

With reference to the second possible implementation manner or the third possible implementation manner of the first aspect of the embodiments of the present invention, in a fifth possible implementation manner of the first aspect of the embodiments, the first request is Digital The parameter selection request defined in the specification is PSL_REQ;

The first response is a parameter selection response PSL_RES defined in the Digital specification;

The first RF interface is a near field communication data exchange protocol NFC-DEP radio frequency interface defined in an NFC controller interface NCI specification;

The first notification is a radio frequency interface activation notification RF_INTF_ACTIVATED_NTF defined in the NCI specification.

A second aspect of the embodiments of the present invention discloses a method for adjusting a data packet length in a near field communication NFC, where the method includes:

The NFCC of the first NFC device receives an adjustment command including a first length value sent by the DH of the first NFC device, where the adjustment command is used to instruct the NFCC to adjust a maximum length value of a data packet transmitted during a subsequent communication process. ;

Sending, by the NFCC, a first request including the first length value to a second NFC device, where the first request is used to indicate that the first NFC device is transmitted during subsequent communication with the second NFC device The maximum length value of the data packet is adjusted to the first length value, the first request further includes a first DID, and the first length value is a value determined by the NFCC;

In a first possible implementation manner of the second aspect of the embodiment, the method further includes:

The NFCC sends an adjustment response including a status indication and/or the first length value to the DH, the status indication indicating that the NFCC has adjusted the maximum length value to the first length value.

With reference to the first possible implementation manner of the second aspect of the embodiment of the present invention, in a second possible implementation manner of the second aspect of the embodiment of the present disclosure, the receiving the DH of the first NFC device includes Before a length value adjustment command, the method further includes:

The NFCC activates a first RF interface and sends a first notification to the DH, the first notification being used to inform the DH that the first RF interface has been activated.

With reference to the first possible implementation manner of the second aspect of the embodiments of the present invention, in a third possible implementation manner of the second aspect of the embodiment, the sending, by the second NFC device, the first length value Before the first request, the method further includes:

Determining that the first length value is less than or equal to the second length value and less than or equal to the third length value.

With reference to the second possible implementation manner of the second aspect of the embodiment of the present invention, in a fourth possible implementation manner of the second aspect of the embodiments, the method further includes:

The NFCC receives the first data message sent by the DH by using the first RF interface, and encapsulates the load in the first data message into the first data by using the first length value as the maximum length value. package;

The NFCC sends the first data packet to the second NFC device.

With reference to the third possible implementation manner of the second aspect of the embodiments of the present invention, in a fifth possible implementation manner of the second aspect of the embodiments, the method further includes:

The NFCC sends a second notification to the DH, the second notification being used to notify the DH of the second The RF interface has been activated, and receives the second data message sent by the DH through the second RF interface, and encapsulates the load in the second data message with the first length value as the maximum length value Into a second data packet;

The NFCC sends the second data packet to the second NFC device.

With reference to the second possible implementation manner of the second aspect of the embodiment of the present invention, in a sixth possible implementation manner of the second aspect of the embodiment, the first request is a PSL_REQ defined in the Digital specification;

The first response is a PSL_RES defined in the Digital specification;

The first RF interface is an NFC-DEP radio frequency interface defined in an NCI specification;

The first notification is RF_INTF_ACTIVATED_NTF defined in the NCI specification.

The third aspect of the embodiment of the present invention discloses an NFCC, where the NFCC is an NFCC in a first NFC device, where the NFCC includes a determining module, a communication module, and a determining module, where:

The determining module is configured to determine whether the NFCC is responsible for determining a maximum length value of the data packet transmitted in the subsequent communication;

The communication module is configured to: when the determination result of the determining module is yes, send a first request including a first length value to the second NFC device, and receive the second NFC device to return for the first request a first response, the first request is used to indicate that a maximum length value of a data packet transmitted by the first NFC device and the second NFC device in a subsequent communication is adjusted to the first length value, and The first request further includes a first DID, the first response includes a second DID, and the first length value is a value determined by the NFCC;

The determining module is configured to use the first length value as a maximum length value of a data packet transmitted in a subsequent communication when the first DID is the same as the second DID.

In a first possible implementation manner of the third aspect of the embodiment of the present invention, the determining module determines whether the NFCC is responsible for determining a maximum length value of a data packet transmitted in a subsequent communication:

Determining whether the value of the first parameter is a first specific value, wherein the first specific value is used to indicate that a maximum length value of the data packet transmitted in the subsequent communication is determined by the NFCC, wherein the value of the first parameter Is the default value of the NFCC, or is the value assigned to the NFCC by the DH of the first NFC device.

With reference to the third aspect of the embodiments of the present invention, the second possible implementation in the third aspect of the embodiment of the present invention In the present mode, the communication module is further configured to send, to the DH of the first NFC device, a first notification that includes the first length value, where the first notification is used to notify the DH of the first radio frequency RF interface. Has been activated, and receives the data message sent by the DH through the first RF interface;

The NFCC also includes a package module, wherein:

The encapsulating module is configured to encapsulate the load in the data message into a data packet by using the first length value as the maximum length value;

The communication module is further configured to send the data packet to the second NFC device.

With reference to the first possible implementation manner of the third aspect of the embodiments of the present invention, in a third possible implementation manner of the third aspect of the embodiments, the communications module is further configured to send the inclusion to the DH. a first notification of a first length value, the first notification being used to notify the DH that the first radio frequency RF interface has been activated;

The communication module is further configured to receive, by using the first RF interface, a data message sent by the DH;

The NFCC also includes a package module, wherein:

With reference to the second possible implementation manner or the third possible implementation manner of the third aspect of the embodiments of the present invention, in a fourth possible implementation manner of the third aspect of the embodiments, the first request is Digital PSL_REQ as defined in the specification;

The first response is a PSL_RES defined in the Digital specification;

A fourth aspect of the embodiments of the present invention discloses an NFCC, where the NFCC is an NFCC in a first NFC device, where the NFCC includes a communication module and a determining module, where:

The communication module is configured to receive an adjustment command including a first length value sent by the DH of the first NFC device, where the adjustment command is used to instruct the NFCC to adjust a maximum length of a data packet transmitted during a subsequent communication process. value;

The communication module is further configured to send a first request that includes the first length value to a second NFC device, and receive a first response that is returned by the second NFC device for the first request, the first please And determining to adjust a maximum length value of the data packet transmitted during the subsequent communication between the first NFC device and the second NFC device to the first length value, where the first request further includes the first DID, the first response includes a second DID;

In a first possible implementation manner of the fourth aspect of the embodiments, the communications module is further configured to send, to the DH, an adjustment response that includes a status indication and/or the first length value, where the status The indication is to indicate that the NFCC has adjusted the maximum length value to the first length value.

With reference to the first possible implementation manner of the fourth aspect of the embodiments of the present invention, in a second possible implementation manner of the fourth aspect of the embodiments, the NFCC further includes an activation module, where:

The activation module is configured to activate the first RF interface before the communication module receives the adjustment command including the first length value sent by the DH of the first NFC device;

The communication module is further configured to send a first notification to the DH, where the first notification is used to notify the DH that the first RF interface has been activated.

With reference to the first possible implementation manner of the fourth aspect of the embodiments of the present invention, in a third possible implementation manner of the fourth aspect of the embodiments, the determining module is further configured to: Before the second NFC device sends the first request including the first length value, determining that the first length value is less than or equal to the second length value and less than or equal to the third length value.

With reference to the second possible implementation manner of the fourth aspect of the embodiments of the present invention, in a fourth possible implementation manner of the fourth aspect of the embodiments, the communications module is further configured to pass the first RF interface. Receiving a first data message sent by the DH;

The NFCC also includes a first encapsulation module, wherein:

The first encapsulating module is configured to encapsulate the load in the first data message into a first data packet by using the first length value as the maximum length value;

The communication module is further configured to send the first data packet to the second NFC device.

With reference to the third possible implementation manner of the fourth aspect of the embodiments of the present invention, in a fifth possible implementation manner of the fourth aspect of the embodiments, the communications module is further configured to send a second to the DH. Notifying that the second notification is that the DH second RF interface has been activated, and receives the second data message sent by the DH by using the second RF interface;

The NFCC further includes a second encapsulation module, wherein:

The second encapsulating module is configured to encapsulate the load in the second data message into a second data packet by using the first length value as the maximum length value;

The communication module is further configured to send the second data packet to the second NFC device.

With reference to the second possible implementation manner of the fourth aspect of the embodiments of the present invention, in a sixth possible implementation manner of the fourth aspect, the first request is a PSL_REQ defined in the Digital specification;

The first response is a PSL_RES defined in the Digital specification;

The fifth aspect of the embodiment of the present invention discloses an NFCC, including a processor and a communication device, where the processor is configured to determine whether the NFCC is responsible for determining a maximum length value of a data packet transmitted in a subsequent communication;

The communication device is configured to: when the determination result of the processor is yes, send a first request including a first length value to the second NFC device, and receive the second NFC device to return for the first request a first response, the first request is used to indicate that a maximum length value of a data packet transmitted by the first NFC device and the second NFC device in a subsequent communication is adjusted to the first length value, where a length value is a value determined by the NFCC, the first request further includes a first DID, and the first response includes a second DID;

The processor is further configured to use, when the first DID is the same as the second DID, the first length value as a maximum length value of a data packet transmitted in a subsequent communication.

In a first possible implementation manner of the fifth aspect of the embodiment of the present invention, the determining, by the NFCC, is determining, by the NFCC, a maximum length value of the data packet transmitted in the subsequent communication, including:

Determining whether the value of the first parameter is a first specific value, wherein the first specific value is used to indicate that a maximum length value of the data packet transmitted in the subsequent communication is determined by the N FCC, wherein the first parameter is determined by The value is the default value of the NFCC or the value assigned to the NFCC by the first NFC device DH.

With reference to the fifth aspect of the embodiments of the present invention, in a second possible implementation manner of the fifth aspect of the embodiments, the communications apparatus is further configured to send, by the DH of the first NFC device, the first length value. a first notification, the first notification being used to notify that the DH first RF interface has been activated;

The communication device is further configured to receive, by using the first RF interface, a data message sent by the DH;

The processor is further configured to encapsulate the load in the data message into a data packet by using the first length value as the maximum length value;

The communication device is further configured to send the data packet to the second NFC device.

With reference to the first possible implementation manner of the fifth aspect of the embodiments of the present invention, in a third possible implementation manner of the fifth aspect of the embodiments, the communications apparatus is further configured to send the inclusion to the DH. Determining a first notification of a first length value, the first notification being used to notify the DH that the first RF interface has been activated;

With reference to the second possible implementation manner or the third possible implementation manner of the fifth aspect of the embodiments of the present invention, in a fourth possible implementation manner of the fifth aspect of the embodiments, the first request is Digital PSL_REQ as defined in the specification;

The first response is a PSL_RES defined in the Digital specification;

A sixth aspect of the embodiments of the present invention discloses an NFCC, including a processor and a communication device, configured to receive an adjustment command including a first length value sent by a DH of the first NFC device, where the adjustment command is And configured to instruct the NFCC to adjust a maximum length value of a data packet transmitted during a subsequent communication process;

The communication device is further configured to send a first request that includes the first length value to a second NFC device, and receive a first response that is returned by the second NFC device for the first request, the first The request is used to indicate that a maximum length value of a data packet transmitted during a subsequent communication between the first NFC device and the second NFC device is adjusted to the first length value, and the first request further includes a first DID The first response includes a second DID;

The processor is configured to use the first length value as a maximum length value of a data packet transmitted in a subsequent communication when the first DID is the same as the second DID.

In a first possible implementation manner of the sixth aspect of the embodiment of the present invention, the communication device is further And an adjustment response for transmitting, to the DH, a status indication and/or the first length value, the status indication is used to indicate that the NFCC has adjusted the maximum length value to the first length value.

With reference to the first possible implementation manner of the sixth aspect of the embodiments of the present invention, in a second possible implementation manner of the sixth aspect of the embodiments, the processor is further configured to receive, at the communication device, Activating the first RF interface before the adjustment command including the first length value sent by the DH of the first NFC device;

The communication device is further configured to send a first notification to the DH, where the first notification is used to notify the DH that the first RF interface has been activated.

With reference to the first possible implementation manner of the sixth aspect of the embodiments of the present invention, in a third possible implementation manner of the sixth aspect of the embodiments, the processor is further used in the communication device Before the second NFC device sends the first request including the first length value, determining that the first length value is less than or equal to the second length value and less than or equal to the third length value.

With reference to the second possible implementation manner of the sixth aspect of the embodiments of the present invention, in a fourth possible implementation manner of the sixth aspect of the embodiments, the communications device is further configured to pass the first RF interface. Receiving a first data message sent by the DH;

The processor is further configured to encapsulate the load in the first data message into a first data packet by using the first length value as the maximum length value;

The communication device is further configured to send the first data packet to the second NFC device.

With reference to the third possible implementation manner of the sixth aspect of the embodiments of the present invention, in a fifth possible implementation manner of the sixth aspect of the embodiments, the communications device is further configured to send the second Notifying that the second notification is that the DH second RF interface has been activated, and receives the second data message sent by the DH by using the second RF interface;

The processor is further configured to encapsulate the load in the second data message into a second data packet by using the first length value as the maximum length value;

The communication device is further configured to send the second data packet to the second NFC device.

With reference to the second possible implementation manner of the sixth aspect of the embodiment of the present invention, in a sixth possible implementation manner of the sixth aspect, the first request is a PSL_REQ defined in the Digital specification;

The first response is a PSL_RES defined in the Digital specification;

In the embodiment of the present invention, the NFCC of the first NFC device as the initiator determines whether the NFCC is responsible for determining the maximum length value of the data packet transmitted in the subsequent communication, and if yes, transmitting the first length to the second NFC device. a first request of a value, wherein the first request is used to indicate that a maximum length value of a data packet transmitted by the first NFC device and the second NFC device in a subsequent communication is adjusted to a first length value, the first length value Is a value determined by the NFCC of the first NFC device, and the first request further includes a first device identifier DID, and receives a first response including the second DID returned by the second NFC device for the first request, when the first DID is the same as the foregoing When the second DID is the same, the first length value is taken as the maximum length value of the data packet transmitted in the subsequent communication. It can be seen that the embodiment of the present invention can implement the function of the first NFC device as the initiator through the NCI specification to adjust the maximum length value of the communication data packet in the subsequent communication process through the NFCC and the second NFC device as the target party.

DRAWINGS

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings to be used in the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the present invention. Those skilled in the art can also obtain other drawings based on these drawings without paying any creative work.

1 is a schematic flowchart of a method for adjusting a data packet length in a near field communication NFC according to an embodiment of the present invention;

2 is a schematic flow chart of another method for adjusting a data packet length in a near field communication NFC according to an embodiment of the present invention;

3 is a schematic flow chart of another method for adjusting a data packet length in a near field communication NFC according to an embodiment of the present invention;

4 is a schematic flow chart of another method for adjusting a data packet length in a near field communication NFC according to an embodiment of the present invention;

FIG. 5 is a schematic flowchart of still another method for adjusting a data packet length in a near field communication NFC according to an embodiment of the present disclosure;

6 is a schematic structural diagram of an NFCC according to an embodiment of the present invention;

7 is a schematic structural diagram of another NFCC according to an embodiment of the present invention;

FIG. 8 is a schematic structural diagram of still another NFCC according to an embodiment of the present invention; FIG.

FIG. 9 is a schematic structural diagram of still another NFCC according to an embodiment of the present invention; FIG.

FIG. 10 is a schematic structural diagram of still another NFCC according to an embodiment of the present invention; FIG.

11 is a schematic structural diagram of still another NFCC according to an embodiment of the present invention;

FIG. 12 is a schematic structural diagram of still another NFCC according to an embodiment of the present invention; FIG.

FIG. 13 is a schematic structural diagram of a system for adjusting a data packet length in a near field communication NFC according to an embodiment of the present invention.

detailed description

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, but not all embodiments. All other embodiments obtained by a person of ordinary skill in the art without departing from the inventive scope are the scope of the invention.

The embodiment of the invention discloses a method, device and system for adjusting the length of a data packet in a near field communication NFC, which can realize the adjustment of the first NFC device as the initiator through the NCI specification and the second NFC device as the target by the NCI specification. The function of the maximum length value of the communication packet during subsequent communication. The details are described below separately.

It should be noted that the DH and NFCC used in the embodiments of the present invention are terms used in the NCI protocol formulated by the NFC Forum. Among them, DH is responsible for the management of the entire NFC device, including the management of the NFC controller, such as initialization, configuration or power management, in the smart phone, it can correspond to the CPU of the mobile phone; DH can correspond to the European Telecommunications Standards Institute (ETSI) , the Terminal Host (HCI) in the Host Controller Interface (HCI) specification developed by the European Telecommunication Standards Institute; in addition, the management entity in the specifications developed by the Global Platform International Standards Organization (GP, Global Platform) ( ME, Managing Entity) If implemented on a Terminal Host, DH can also be referred to as a Management Host (MH). The NFCC is the entity responsible for data transmission of the NFC chip, and is usually used directly to refer to the NFC chip; the NFCC can correspond to the non-contact front end (CLF, Contactless) in the HCI specification developed by the European Telecommunication Standards Institute (ETSI). Front-end) At this time, the host controller in the HCI is implemented on the NFCC.

Please refer to FIG. 1. FIG. 1 is a diagram of adjusting the length of a data packet in a near field communication NFC according to an embodiment of the present invention. Schematic diagram of the method of degree. Among them, the method shown in FIG. 1 is applied to the NFCC of the first NFC device as the initiator. As shown in FIG. 1, the method for adjusting the packet length in the near field communication NFC may include the following steps:

S101. Determine whether the NFCC is responsible for determining a maximum length value of the data packet transmitted in the subsequent communication.

In the embodiment of the present invention, when the determination result of step S101 is YES, the NFCC of the first NFC device may perform step S102, that is, the NFCC of the first NFC device sends the first length value to the second NFC device as the target party. The first request; when the determination result of the step S101 is NO, the NFCC of the first NFC device may end the current process, that is, the NFCC of the first NFC device does not send the first request including the first length value to the second NFC device.

In the embodiment of the present invention, before the NFCC of the first NFC device performs step S101, the first NFC device and the second NFC device have activated the MAC layer, that is, the first NFC device and the second NFC device have negotiated with the ATR_RES through ATR_REQ. The maximum length value of the data packet transmitted in the subsequent communication process, that is, the second length value and the third length value, wherein the second length value is set by the first NFC device and is used to limit the second NFC device in the subsequent communication process. The length of the data packet sent (ie, the length of the data packet transmitted from the second NFC device to the direction of the first NFC device), the third length value being set by the second NFC device and used to limit the first NFC device in subsequent The length of the data packet sent during the communication (ie the length of the data packet transmitted from the first NFC device to the second NFC device), that is, the length of the data packet sent by the second NFC device in subsequent communication The second length value cannot be exceeded, and the length of the data packet sent by the first NFC device cannot exceed the third length value.

In the embodiment of the present invention, the determination result of step S101 is that the NFCC of the first NFC device can adjust the maximum length of the data packet transmitted by the first NFC device and the second NFC device in the subsequent communication process after the MAC layer is activated. A value that limits the length of the data packets transmitted from the first NFC device to the second NFC device and from the second NFC device to the first NFC device, respectively.

S102. Send a first request that includes a first length value to the second NFC device.

In the embodiment of the present invention, the first request is used to indicate that a maximum length value of a data packet transmitted by the first NFC device and the second NFC device in a subsequent communication process is adjusted to a first length value included in the first request. The first length value is a length value determined by the NFCC of the first NFC device, the first length value is less than or equal to the second length value and less than or equal to the third length value, and the first length value is A request further includes a first device identification DID (Device Identification Number).

In the embodiment of the present invention, the first request may be a parameter selection request PSL_REQ defined in the Digital specification defined by the NFC Forum, wherein the fifth byte (Byte 5) represents an FSL parameter, and the value of the byte defines the command and response. The maximum length value, further, the values corresponding to the first and second bits in the byte (ie, b1 and b2 defined in the Digital specification) represent the maximum length value, for example, when the values of the two bits are here When it is 00b, the maximum length value is 64 bytes; when the value of the two bits is 01b, the maximum length value is 128 bytes; when the value of the two bits is 10b, the maximum length value is It is 192 bytes; when the value of two bits here is 11b, the maximum length value is 254 bytes. Therefore, adjusting the maximum length value by PSL_REQ and PSL_RES can be understood as switching from one length value to another length value, and can also be understood as renegotiation or modification of the maximum length value, etc., which is not correct in the embodiment of the present invention. Limit the meaning of the word "adjustment".

The command and response may be commands and responses used when communicating through the NFC-DEP protocol, such as a data exchange protocol request (DEP_REQ, Data Exchange Protocol Request) and a data exchange protocol response (DEP_RES, Data Exchange Protocol Response). The above command and response can be encapsulated in a data packet as a payload (the upper-layer application-related business data), and then NFC-A technology (ie, type A radio frequency technology defined in the NFC forum, corresponding to the NFC device) ISO/IEC 14443, abbreviated type A) NFC-A Technology standard frame or NFC-F technology (ie type F radio technology defined in the NFC Forum, corresponding to the 212 kbps and 424 kbps communication mechanisms of ISO/IEC 18092) Abbreviation) The frame format (NFC-F Technology frame) is sent out. Therefore, the above maximum length value can be understood as the maximum value of the packet length, and can also be understood as the maximum value of the number of payloads of the above command and response.

In the embodiment of the present invention, the NFCC of the first NFC device sends a first request including the first length value to the second NFC device, so that the second NFC device does not accept the maximum length of the data packet transmitted during the subsequent communication. When the value is adjusted to the first length value, no response is returned, or the second NFC device returns a response indicating that the maximum length value of the data packet transmitted during the subsequent communication is not accepted to be adjusted to the first length value. For example, the DID included in the response is not equal to the DID included in the first request, to indicate that the second NFC device does not accept the first length value, or that the second NFC device returns to indicate that the acceptance will be followed. The maximum length value of the data packet transmitted during the communication is adjusted to the response of the first length value, for example, the device identifier DID included in the response is equal to the DID included in the first request, to indicate the second NFC device. Accept the above first length value.

In the embodiment of the present invention, the NFCC of the first NFC device sends the first request including the first length value to the second NFC device, that is, the NFCC of the first NFC device sends the first length value to the NFCC of the second NFC device. A request.

S103. Receive a first response returned by the second NFC device for the first request.

In this embodiment of the present invention, the first response may include a second DID.

S104. When the first DID is the same as the second DID, the first length value is used as a maximum length value of the data packet transmitted in the subsequent communication.

In the embodiment of the present invention, when the first DID is the same as the second DID, the first response is used to indicate that the second NFC device has adjusted the maximum length value of the data packet transmitted in the subsequent communication process to the first a length value, wherein the first DID and the second DID are both device identifiers of the second NFC device, and for example, for the NFC-DEP protocol, the second DID is the first NFC device acting as the initiator in passing the ATR_REQ An identifier assigned to the second NFC device as the target when the MAC layer is activated to identify the second NFC device; and by way of example, for the ISO-DEP protocol, the second DID is used as a reader (Reader) The first NFC device of /Writer) is an identifier assigned to the second NFC device to identify the second NFC device when the second NFC device that is the NFC tag or the card emulation is activated by the RATS Command or the ATTRIB Command.

As an optional implementation manner, whether the NFCC of the first NFC device determines whether it is responsible for determining the maximum length value of the data packet transmitted in the subsequent communication may include:

Determining whether the value of the first parameter is a first specific value, wherein the first specific value is used to indicate that the maximum length value of the data packet transmitted in the subsequent communication is determined by the NFCC in the first NFC device, and the first parameter The value of the NFCC in the first NFC device may be the default value of the NFCC in the first NFC device (ie, the default value set in the NFCC when the NFC chip is shipped from the factory), or may be the value of the NFCC configured by the DH of the first NFC device to the first NFC device. The embodiments of the present invention are not limited.

As an optional implementation manner, after the NFCC of the first NFC device is executed, the NFCC of the first NFC device may further perform the following operations:

Sending, to the DH of the first NFC device, a first notification that includes the foregoing first length value, where the first notification is used to notify the first NFC device that the DH first radio frequency (RF) interface has been activated;

Receiving, by the first RF interface, a data message sent by the DH of the first NFC device, and encapsulating the load in the data message into a data packet by using the first length value as the maximum length value, that is, the data packet The length value is less than or equal to the first length value;

The data packet is sent to the second NFC device.

In the optional implementation, the NFCC of the first NFC device sends the foregoing first notification that includes the first length value to the DH of the first NFC device, and the first notification is to report the first NFC device to the DH of the first NFC device. The maximum length of the data packet transmitted in the subsequent communication of the second NFC device is the first length value, so that the DH of the first NFC device can obtain the first length value and can be used in the upper layer service, for example, , estimating the time required to complete the transmission of the upper layer service related data in the communication, and the like, and notifying the first NFC device that the first RF interface of the first NFC device has been activated, that is, the NFCC of the first NFC device has been Ready to receive the data message sent by the DH of the first NFC device. The data message may be a Data Message(s) defined in the NCI specification, where the Data Message(s) is transmitted between the DH and the NFCC by transmitting the Data Packet(s), and the load in the data message is (payload) can carry data related to upper layer services.

In addition, in the optional implementation manner, the foregoing data packet may be understood as a frame that carries the DEP_REQ in the corresponding technical frame format, as defined in the Digital specification, as described above; for the sake of simplicity of description, the foregoing data packet may also be understood as a Digital specification. Defining the DEP_REQ, the packet in the data message is encapsulated into a data packet by using the first length value as the maximum length value, that is, the load in the data message is encapsulated in at least one DEP_REQ, and the length of the DEP_REQ is guaranteed. The first length value is not exceeded to ensure that the NFCC of the first NFC device can send the DEP_REQs through corresponding frame formats (for example, NFC-A technical standard frame format, NFC-F technical frame format, etc.) (ie, these DEP_REQs) The encapsulation is sent out in the frame of the corresponding format). Therefore, the foregoing specific operation of sending the data packet to the second NFC device and subsequent steps thereof may be:

Sending DEP_REQ (in a certain frame format) to the second NFC device, so that the second NFC device returns DEP_RES to the NFCC of the first NFC device when determining that the length value of the DEP_REQ is less than or equal to the first length value;

Receiving a DEP_RES returned by the second NFC device, and determining whether the length of the DEP_RES is less than or equal to the first length value;

When it is determined that the length of the DEP_RES is less than or equal to the first length value, the DEP_RES (specifically, the service-related data in the DEP_RES) is acquired and forwarded to the DH of the first NFC device.

Optionally, the first request may be the PSL_REQ defined in the Digital specification, and the first ringing The first RF interface may be an NFC-DEP radio interface defined in the NCI specification, and the first notification may be a radio interface activation notification RF_INTF_ACTIVATED_NTF defined in the NCI specification, and the present invention is applicable to the PSL_RES defined in the Digital specification. The embodiment is not limited.

It should be noted that the foregoing first request may also be a RATS Command or an ATTRIB Command applicable to the ISO-DEP protocol defined in the Digital specification, and the FSDI (Frame Size for proximity Couple Device Integer) parameter is included in the calculation work in the round. The maximum length value FSD of a data packet (for example, an information block I-block or a load payload of the I-block) that can be accepted by an NFC device (for example, a reader/writer) in a poll mode; correspondingly, the first The response may also be a RATS Response or an ATTRIB Response defined in the Digital specification, which may include a FSCI (Frame Size for proximity Card Integer) parameter for calculating that an NFC device (eg, an NFC tag or card emulation) operating in poll mode can accept The maximum length value FSC of the data packet (for example, the information block I-block or the load payload of the I-block); the first RF interface may be an ISO-DEP radio interface or an NDEF radio interface defined in the NCI specification, the first The notification can be RF_INTF_ACTIVATED_NTF as defined in the NCI regulations. In this case, the “adjustment” used in the solution of the present invention can be understood as a negotiation, a limitation, and the like in addition to the meaning of the present invention, and the present invention does not limit this.

In addition, it should be noted that the understanding of “adjustment” in the embodiment of the present invention, the description of the maximum length value, the first length value, the second length value, and the third length value, for the first request and the first response The description, the description of the device identifier DID, and the explanation of the first RF interface and the first notification, and the like are also applicable to the following embodiments of the invention, and will not be described again.

In the embodiment of the present invention, the NFCC of the first NFC device determines whether the NFCC is responsible for determining the maximum length value of the data packet transmitted in the subsequent communication, and if yes, transmitting the first length value including the first length value to the second NFC device. a request, wherein the first request is used to adjust a maximum length value of a data packet transmitted by the first NFC device and the second NFC device in a subsequent communication to a first length value, when receiving the second NFC device for the first When the first response returned by the request and the first DID included in the first response is the same as the second DID included in the first request, the NFCC of the first NFC device sets the first length value included in the first request Determining a maximum length value of a data packet transmitted by the first NFC device and the second NFC device during subsequent communication. It can be seen that the embodiment of the present invention can implement the function of the first NFC device as the initiator through the NCI specification to adjust the maximum length value of the data packet in the subsequent communication process through the NFCC and the second NFC device as the target.

Referring to FIG. 2, FIG. 2 is a schematic flowchart diagram of another method for adjusting a data packet length in a near field communication NFC according to an embodiment of the present invention. Among them, the method shown in FIG. 2 is applied to the NFCC of the first NFC device as the initiator. As shown in FIG. 2, the method for adjusting the packet length in the near field communication NFC may include the following steps:

S201. Receive an adjustment command that includes a first length value sent by the DH of the first NFC device.

In the embodiment of the present invention, the adjustment command is used to indicate that the NFCC of the first NFC device adjusts the maximum length value of the data packet transmitted in the subsequent communication process.

In the embodiment of the present invention, before the NFCC of the first NFC device performs the step S201, the first NFC device and the second NFC device have activated the MAC layer, that is, the first NFC device and the second NFC device have passed the ATR_REQ and the ATR_RES. Negotiating the maximum length value of the data packet transmitted during the subsequent communication, that is, the second length value and the third length value, wherein the second length value is set by the first NFC device and used to limit the second NFC device in subsequent communication The length of the data packet sent during the process (ie the length of the data packet transmitted from the second NFC device to the direction of the first NFC device), the third length value being set by the second NFC device and used to limit the first NFC device The length of the data packet sent during the subsequent communication (ie, the length of the data packet transmitted from the first NFC device to the second NFC device), that is, the data packet sent by the second NFC device in subsequent communication. The length cannot exceed the second length value, and the length of the data packet sent by the first NFC device cannot exceed the third length value.

In the embodiment of the present invention, the NFCC of the first NFC device receiving the foregoing adjustment command means that the NFCC of the first NFC device can adjust the data transmitted by the first NFC device and the second NFC device in the subsequent communication process after the MAC layer is activated. The maximum length value of the packet, which limits the length of the data packets respectively transmitted from the first NFC device to the second NFC device and from the second NFC device to the first NFC device.

S202. Send a first request that includes the first length value to the second NFC device.

In the embodiment of the present invention, the first request is used to indicate that a maximum length value of a data packet transmitted by the first NFC device and the second NFC device in a subsequent communication process is adjusted to a first length value included in the first request. The first length value is less than or equal to the second length value and less than or equal to the third length value, and the first request further includes the first DID.

In the embodiment of the present invention, the NFCC of the first NFC device sends a first request including the first length value to the second NFC device, so that the second NFC device does not accept the maximum length of the data packet transmitted during the subsequent communication. Does not return any response when the value is adjusted to the first length value above, or to make the second NFC The device returns a response indicating that the maximum length value of the data packet transmitted during the subsequent communication is not accepted to be adjusted to the first length value, for example, the DID included in the response is not equal to the DID included in the first request. To indicate that the second NFC device does not accept the first length value, or to cause the second NFC device to return to indicate that the maximum length value of the data packet transmitted during the subsequent communication is accepted to be the first length value. In response, for example, the DID included in the response is equal to the DID included in the first request to indicate that the second NFC device accepts the first length value.

In the embodiment of the present invention, the NFCC of the first NFC device sends the first request including the first length value to the second NFC device, that is, the NFCC of the first NFC device sends the NFCC of the second NFC device to include the first length value. First request.

S203. Receive a first response returned by the second NFC device for the first request.

In the embodiment of the present invention, the first response includes a second DID.

S204. When the first DID is the same as the second DID, the first length value is used as a maximum length value of the data packet transmitted in the subsequent communication.

In the embodiment of the present invention, when the second DID included in the first response is the same as the first DID included in the first request, the first response is used to indicate that the second NFC device has transmitted the subsequent communication process. The maximum length value of the data packet is adjusted to the first length value, wherein the first DID and the second DID are both device identifiers of the second NFC device, and for example, for the NFC-DEP protocol, the second DID is The first NFC device as the initiator, which is assigned to the second NFC device as the target when the MAC layer is activated by the ATR_REQ, is used to identify one identifier of the second NFC device; and for example, for the ISO-DEP protocol, The second DID is allocated to the second NFC device as a first NFC device as a reader/writer (Reader/Writer) when the second NFC device is activated as an NFC tag or a card emulation by the RATS Command or the ATTRIB Command. An identifier identifying the second NFC device.

As an optional implementation manner, after the NFCC of the first NFC device performs the step S204, the NFCC of the first NFC device may further perform the following operations:

Transmitting, to the DH of the first NFC device, an adjustment response including a status indication and/or the first length value, wherein the status indication indicates that the NFCC of the first NFC device has adjusted the maximum length value to the first length value That is to say, this adjustment has been completed between the first NFC device and the second NFC device.

As an optional implementation manner, before performing step S201, the NFCC of the first NFC device You can also do the following:

The first RF interface is activated and a first notification is sent to the DH of the first NFC device, wherein the first notification is used to inform the DH of the first NFC device that the first RF interface has been activated.

It should be noted that, at this time, the first NFC device and the second NFC device activate the MAC layer between the first NFC device and the second NFC device by using ATR_REQ and ATR_RES, that is, the first NFC device and the second NFC device have negotiated The maximum length value of the data packets respectively transmitted in the two directions in the subsequent communication, that is, the second length value and the third length value in the above embodiment. In the embodiment of the present invention, when the NFCC of the first NFC device sends the first notification to the DH of the first NFC device, the parameter value in the ATR_RES may be carried, including the third length value. For details, refer to the NCI specification.

As another optional implementation manner, after performing step S201 and before performing step S202, the NFCC of the first NFC device may further perform the following operations:

It should be noted that, in the optional implementation manner, the sending, by the DH of the first NFC device, the foregoing adjustment command to the NFCC of the first NFC device may occur before the first NFC device directly activates the MAC layer by using the NFCC and the second NFC device, or After that, because the DH of the first NFC device does not know the second length value and the third length value that the NFCC of the first NFC device and the second NFC device are about to negotiate or have negotiated, the DH of the first NFC device is The first length value of the sent adjustment command may be greater than, equal to, or less than the second length value or the third length value, then the NFCC of the first NFC device prevents the first length value from exceeding the second length value or For a three-length value, the NFCC of the first NFC device needs to perform the above operations to ensure that the first length value is less than or equal to the second length value and the third length value.

As an optional implementation manner, in a case where the NFCC of the first NFC device first activates the first RF interface and sends the first notification to the DH of the first NFC device, and then performs step S201, After the DH of the NFC device sends an adjustment response including the status indication and/or the first length value, the NFCC of the first NFC device may also perform the following operations:

Receiving, by the first RF interface, the first data message sent by the DH of the first NFC device, and encapsulating the load in the first data message into the first data packet by using the first length value as the maximum length value, that is, the first data packet The length value of a data packet is less than or equal to the first length value;

The first data packet is sent to the second NFC device.

As an alternative embodiment, the determination is performed after step S201 and before step S202 When the first length value is less than or equal to the second length value and less than or equal to the third length value, the adjustment of the status indication and/or the first length value is sent to the DH of the first NFC device. After the response, the NFCC of the first NFC device can also perform the following operations:

Sending a second notification to the DH of the first NFC device, wherein the second notification is used to notify that the DH second RF interface of the first NFC device has been activated;

Receiving, by the second RF interface, the second data message sent by the DH of the first NFC device, and packaging the load in the second data message into the second data packet by using the first length value as the maximum length value, that is, the second data packet The length value of the data packet is less than or equal to the first length value;

The second data packet is sent to the second NFC device.

It should be noted that the first length value may be included in the second notification, and may not be included.

Optionally, the first request may be a PSL_REQ defined in the Digital specification, and the first response may be a PSL_RES defined in the Digital specification, and the first RF interface and the second RF interface may be an NFC defined in the NCI specification. The DEP radio interface, and the foregoing first notification and the second notification may be the radio interface activation notification RF_INTF_ACTIVATED_NTF defined in the NCI specification, which is not limited in the embodiment of the present invention.

It should be noted that the foregoing first request may also be a RATS Command or an ATTRIB Command applicable to the ISO-DEP protocol defined in the Digital specification, and the FSDI (Frame Size for proximity Couple Device Integer) parameter is included in the calculation work in the round. The maximum length value FSD of a data packet (for example, an information block I-block or a load payload of the I-block) that can be accepted by an NFC device (for example, a reader/writer) in a poll mode; correspondingly, the first The response may also be a RATS Response or an ATTRIB Response defined in the Digital specification, which may include a FSCI (Frame Size for proximity Card Integer) parameter for calculating that an NFC device (eg, an NFC tag or card emulation) operating in poll mode can accept The maximum length value FSC of the data packet (for example, the information block I-block or the load payload of the I-block); the first RF interface and the second RF interface may be an ISO-DEP radio interface or NDEF defined in the NCI specification. The radio frequency interface, the first notification and the second notification may be RF_INTF_ACTIVATED_NTF defined in the NCI specification. In this case, the “adjustment” used in the solution of the present invention can be understood as a negotiation, a limitation, and the like in addition to the meaning of the present invention, and the present invention does not limit this.

In the embodiment of the present invention, the NFCC of the first NFC device determines whether it receives the adjustment command including the first length value sent by the DH of the first NFC device, where the adjustment command is used to indicate the first NFC. The NFCC of the device adjusts the maximum length value of the data packet transmitted during the subsequent communication, and when the determination result is yes, sends a first request including the first length value to the second NFC device, where the first request is used for Adjusting a maximum length value of the data packet transmitted during the subsequent communication between the first NFC device and the second NFC device to a first length value, when receiving the first response returned by the second NFC device for the first request, and the first When the first DID included in the response is the same as the second DID included in the first request, the NFCC of the first NFC device determines the first length value included in the first request as the first NFC device and the second NFC device. The maximum length of the data packet transmitted during subsequent communications. It can be seen that the embodiment of the present invention can implement the function of the first NFC device as the initiator through the NCI specification to adjust the maximum length value of the communication data packet in the subsequent communication process through the NFCC and the second NFC device as the target party.

Please refer to FIG. 3. FIG. 3 is a schematic flowchart diagram of another method for adjusting the length of a data packet in a near field communication NFC according to an embodiment of the present invention. The method shown in FIG. 3 is applied to the NFCC of the second NFC device as the target party that performs point-to-point communication with the first NFC device as the initiator in the above embodiment. As shown in FIG. 3, the method for adjusting the packet length in the near field communication NFC may include the following steps:

S301. Receive a first request that includes a first length value sent by an NFCC of the first NFC device.

In the embodiment of the present invention, the NFCC of the second NFC device performs the step S301, that is, the first NFC device and the second NFC device have activated the MAC layer, that is, the first NFC device and the second NFC device have negotiated with the ATR_RES through the ATR_REQ. The maximum length value of the data packet transmitted in the subsequent communication process, that is, the second length value and the third length value, wherein the second length value is set by the first NFC device and is used to limit the second NFC device in the subsequent communication process. The length of the data packet sent (ie, the length of the data packet transmitted from the second NFC device to the direction of the first NFC device), the third length value being set by the second NFC device and used to limit the first NFC device in subsequent The length of the data packet sent during the communication (ie the length of the data packet transmitted from the first NFC device to the second NFC device), that is, the length of the data packet sent by the second NFC device in subsequent communication The second length value cannot be exceeded, and the length of the data packet sent by the first NFC device cannot exceed the third length value.

In the embodiment of the present invention, the first request that the NFCC of the second NFC device receives the first length value is determined by the NFCC of the first NFC device to determine that the NFCC is responsible for determining the maximum number of data packets transmitted in the subsequent communication. The length value or the inclusion of the DH transmission received by the NFCC at the first NFC device A first length value and a request issued after the adjustment command to instruct the NFCC of the first NFC device to adjust the maximum length value of the data packet transmitted during the subsequent communication. And the first request is used to indicate that the maximum length value of the data packet transmitted by the first NFC device and the second NFC device in the subsequent communication process is adjusted to a first length value included in the first request, where the first The length value is less than or equal to the second length value and less than or equal to the third length value, and the first request may further include the first DID.

S302. Determine whether the NFCC of the second NFC device is responsible for responding to the first request.

In the embodiment of the present invention, when the determination result of step S302 is YES, the NFCC of the second NFC device may perform step S303; when the determination result of step S302 is negative, the NFCC of the second NFC device may perform step S304, optionally The NFCC of the second NFC device may also not return any response to the first NFC device, or return an error to the first NFC device, for example, the NFCC of the second NFC device sets the DID therein to be not equal to the first The DID in the request indicates that there is an error.

In the embodiment of the present invention, the NFCC of the second NFC device determines whether it is responsible for responding to the first request that the NFCC of the second NFC device determines whether the NFCC of the second NFC device is responsible for confirming the first content included in the first request. Length value.

As an optional implementation manner, determining, by the NFCC of the second NFC device, whether the NFCC of the second NFC device is responsible for responding to the foregoing first request may include:

Determining whether the value of the first parameter in the NFCC of the second NFC device is a specific value, wherein the specific value is used to indicate that the NFCC of the second NFC device is responsible for responding to the first request, and the value of the first parameter may be The default value of the NFCC of the second NFC device (ie, can be understood as the default value set in the NFCC when the NFC chip is shipped), or the value of the NFCC configured by the DH of the second NFC device to the second NFC device, The embodiments of the invention are not limited.

It should be noted that the first parameter in the embodiment of the present invention may not be the same parameter as the first parameter in the previous embodiment.

S303. Send a first response to the first request according to the NFCC of the first NFC device.

In the embodiment of the present invention, the sending, by the NFCC of the second NFC device, the first response to the first request to the NFCC of the first NFC device may include:

Determining whether the first length value in the first request is less than or equal to the second length value and less than or equal to the third length value;

When the determination result is yes, sending to the NFCC of the first NFC device is used to indicate the second NFC device. Receiving a first response that adjusts a maximum length value of the data packet transmitted during the subsequent communication to the first length value, wherein the second DID included in the first response and the first DID included in the first request The same, and the second DID included in the first response and the first DID included in the first request are both device identifiers of the second NFC device;

When the determination result is no, sending, to the NFCC of the first NFC device, a first response for indicating that the second NFC device does not accept the maximum length value of the data packet transmitted in the subsequent communication process to be adjusted to the first length value, For example, the DID included in the first response is not equal to the DID included in the first request, to indicate that the second NFC device does not accept the first length value.

Optionally, after the step S303 is performed and the first response is used to indicate that the second NFC device accepts to adjust the maximum length value of the data packet transmitted in the subsequent communication process to the first length value, for example, the first When the DID included in the response is equal to the DID included in the first request (that is, the second NFC device accepts the first length value), the NFCC of the second NFC device may also perform the following operations:

The first length value is sent to the DH of the second NFC device by the first notification.

S304. Activate a first RF interface on the second NFC device, and send a second notification that includes the first length value to the DH of the second NFC device.

In the embodiment of the present invention, the NFCC of the second NFC device sends a second notification including the foregoing first length value to the DH of the second NFC device to notify the first RF interface on the DN second NFC device of the second NFC device. Has been activated and causes the DH of the second NFC device to determine whether the first length value is less than or equal to the second length value and is less than or equal to the third length value.

S305. Receive a second response returned by the DH of the second NFC device.

In the embodiment of the present invention, the second response is used to indicate whether the DH of the second NFC device accepts to adjust the maximum length value of the data packet transmitted in the subsequent communication process to the first length value, and the second response is The DH of the second NFC device determines whether the first length value is less than or equal to the second length value and is less than or equal to the third length value, and then returns a second response returned by the data message, that is, when the first When the length value is less than or equal to the second length value and less than or equal to the third length value, the second response is used to indicate that the DH accepting of the second NFC adjusts the maximum length value of the data packet transmitted in the subsequent communication process to the foregoing a first length value; when the first length value is greater than the second length value or the first length value is greater than the third length value, the second response is used to indicate that the DH of the second NFC device does not accept the subsequent communication process Maximum length adjustment of the packets transmitted in Is the first length value described above.

S306. Send the second response to the NFCC of the first NFC device.

Optionally, the first request may be a PSL_REQ defined in the Digital specification, and the first response and the second response may be PSL_RES defined in the Digital specification, and the first RF interface may be an NFC defined in the NCI specification. The DEP radio interface, and the foregoing first notification and the second notification may be the RF_INTF_ACTIVATED_NTF defined in the NCI specification, which is not limited in the embodiment of the present invention.

It should be noted that, optionally, the NFCC of the second NFC device may not follow the manner of the foregoing step S304, that is, the first RF interface is not activated, but the data packet defined by the NCI specification (Data Message/Packet) The first length value is reported to DH. Correspondingly, after the step S305, the NFCC of the second NFC device may send the second notification to the DH to notify the DH of the second NFC device that the first RF interface is activated.

In addition, the above step S302 is optional, that is, the NFCC has the ability or authority to process and respond to the first request by default.

Optionally, after the second NFC device accepts to adjust the maximum length value of the data packet transmitted in the subsequent communication process to the foregoing first length value, the NFCC of the second NFC device may further perform the following operations:

Receiving the encapsulated data packet sent by the NFCC of the first NFC device (as described in the foregoing embodiment, the data packet can be understood as the above DEP_REQ);

Determining whether the length value of the data packet is less than or equal to the first length value;

When the determination result is yes, the data packet is decapsulated to obtain data related to the upper layer service, and the data related to the upper layer service is sent to the DH of the second NFC device by using the first RF interface.

In the embodiment of the present invention, the NFCC of the second NFC device as the target party receives the first request for adjusting the maximum length value of the data packet transmitted in the subsequent communication process, which is sent by the NFCC of the first NFC device as the initiator, And determining whether the NFCC of the second NFC device is responsible for responding to the first request, and when the determination result is yes, returning a response to the first request to the NFCC of the first NFC device, and when the determination result is no, activating the second NFC An RF interface on the device and transmitting a notification including a first length value to the DH of the second NFC device, receiving a response returned by the DH of the second NFC device, and transmitting the response to the NFCC of the first NFC device, wherein the response When the first DID included in the first DID is the same as the DID included in the first request, the response is used to indicate that the second NFC device has transmitted the subsequent communication process. The maximum length value of the packet is adjusted to the first length value. It can be seen that the embodiment of the present invention can implement the function of the first NFC device as the initiator through the NCI specification to adjust the maximum length value of the communication data packet in the subsequent communication process through the NFCC and the second NFC device as the target party.

Referring to FIG. 4, FIG. 4 is a schematic flowchart of another method for adjusting a data packet length in a near field communication NFC according to an embodiment of the present invention. The method shown in FIG. 4 is applied to the first NFC device as the initiator and the second NFC device as the target, wherein the first NFC device and the second NFC device are each composed of at least NFCC and DH, and the first The MAC layer is activated by both the NFC device and the second NFC device, that is, the first NFC device and the second NFC device have negotiated the maximum length value of the data packet transmitted in the subsequent communication process, that is, the second length, through the ATR_REQ and the ATR_RES. And a third length value, wherein the second length value is set by the first NFC device and is used to limit the length of the data packet sent by the second NFC device during the subsequent communication (ie, from the second NFC device to the first NFC device a length of the data packet transmitted in the direction), the third length value being set by the second NFC device and used to limit the length of the data packet sent by the first NFC device during the subsequent communication (ie, from the first NFC device to the second The length of the data packet transmitted in the direction of the NFC device, that is, in the subsequent communication, the length of the data packet sent by the second NFC device cannot exceed the second length value, and the length of the data packet sent by the first NFC device cannot be Exceeded the third length value. As shown in FIG. 4, the method for adjusting the packet length in the near field communication NFC may include the following steps:

S401. The NFCC of the first NFC device determines whether it is responsible for determining the maximum length value of the data packet transmitted in the subsequent communication.

In the embodiment of the present invention, when the determination result in step S401 is YES, the NFCC of the first NFC device performs step S402; when the determination result in step S401 is negative, the NFCC of the first NFC device may end the current process.

S402. The NFCC of the first NFC device sends a first request including a first length value to the NFCC of the second NFC device.

In the embodiment of the present invention, the first request is used to indicate that a maximum length value of a data packet transmitted by the first NFC device and the second NFC device in a subsequent communication process is adjusted to a first length value included in the first request. The first length value is a length value determined by the NFCC of the first NFC device, the first length value is less than or equal to the second length value and less than or equal to the third length value, and the first request is It can also contain the first DID.

S403. The NFCC of the second NFC device receives the first request, and determines whether the NFCC of the second NFC device is responsible for responding to the first request.

In the embodiment of the present invention, when the determination result of step S403 is YES, the NFCC of the second NFC device may perform step S404; when the determination result of step S403 is negative, the NFCC of the second NFC device may perform step S405.

S404. The NFCC of the second NFC device sends a first response to the first request to the NFCC of the first NFC device.

When the determination result is yes, sending, to the NFCC of the first NFC device, a first response for instructing the second NFC device to accept the maximum length value of the data packet transmitted in the subsequent communication process to be adjusted to the first length value, where The first DID included in the first response is the same as the second DID included in the first request, and the first DID included in the first response and the second DID included in the first request are both second. Device identification of the NFC device;

When the determination result is no, the first response to the NFCC of the first NFC device is sent to instruct the second NFC device not to accept the maximum length value of the data packet transmitted in the subsequent communication process to be adjusted to the first length value.

Optionally, when the first length value in the first request is greater than the second length value or greater than the third length value, the NFCC of the second NFC device may not return any response to the NFCC of the first NFC device. The response error message may also be returned to the NFCC of the first NFC device, which is not limited in the embodiment of the present invention.

S405. The NFCC of the second NFC device activates the first RF interface on the second NFC device.

S406. The NFCC of the second NFC device sends a first notification including the foregoing first length value to the DH of the second NFC device.

In the embodiment of the present invention, the NFCC of the second NFC device sends a first notification including the foregoing first length value to the DH of the second NFC device to notify the first RF interface of the DN second NFC device of the second NFC device. Has been activated and causes the DH of the second NFC device to determine whether the first length value is less than or equal to the second length value and is less than or equal to the third length value.

S407. The DH of the second NFC device receives the first notification, and determines whether the first length value is less than or equal to the second length value and is less than or equal to the third length value.

In the embodiment of the present invention, when the determination result of step S407 is YES, the DH of the second NFC device may perform step S408; when the determination result of step S407 is negative, the DH of the second NFC device may be to the second NFC device. The NFCC returns a response error message.

S408. The DH of the second NFC device sends a second response to the NFCC of the second NFC device by using a data packet.

In the embodiment of the present invention, the second response is used to indicate whether the DH of the second NFC device accepts to adjust the maximum length value of the data packet transmitted in the subsequent communication process to the first length value.

S409. The NFCC of the second NFC device sends the foregoing second response to the NFCC of the first NFC device.

S410. The NFCC of the first NFC device receives a response sent by the NFCC of the second NFC device.

In the embodiment of the present invention, the response received by the NFCC of the first NFC device is the first response or the second response.

S411: When the DID included in the response received by the NFCC of the first NFC device is the same as the DID included in the first request, the NFCC of the first NFC device uses the first length value as the data transmitted in the subsequent communication process. The maximum length of the packet.

Optionally, after the step S411 is performed, the NFCC of the first NFC device may further perform step S412, step S413, and step S414, where:

S412. The NFCC of the first NFC device sends a second notification including the foregoing first length value to the DH of the first NFC device.

In the embodiment of the present invention, the second notification is used to notify the DH of the first NFC device that the second RF interface in the first NFC device has been activated.

In the embodiment of the present invention, the NFCC of the first NFC device sends the foregoing second notification that includes the first length value to the DH of the first NFC device, and the purpose is to report the first NFC device and the second NFC to the DH of the first NFC device. The maximum length of the data packet transmitted in the subsequent communication after the device is adjusted is the first length value, so that the DH of the first NFC device can obtain the first length value and can be used in the upper layer service, for example, estimating. What is the time required to complete the transmission of the upper layer service related data in this communication, and the DH of the first NFC device is notified that the second RF interface has been activated, that is, the NFCC of the first NFC device is ready. Receiving data sent by the DH of the first NFC device interest. The data message may be a Data Message(s) defined in the NCI specification, where the Data Message(s) is transmitted between the DH and the NFCC by transmitting the Data Packet(s), and the load in the data message is (payload) can carry data related to upper layer services.

S413. Receive, by using the foregoing second RF interface, a data message sent by the DH of the first NFC device, and encapsulate the load in the data message into a data packet by using the first length value as the maximum length value.

In the embodiment of the present invention, the data packet and the data packet are the data packet described in the foregoing embodiment, that is, the data packet can be understood as DEP_REQ, and the length value thereof is less than or equal to the first length value;

S414. Send the foregoing data packet to the NFCC of the second NFC device.

Optionally, whether the NFCC of the first NFC device determines whether it is responsible for determining a maximum length value of the data packet transmitted in the subsequent communication may include:

Determining whether the value of the first parameter in the NFCC of the first NFC device is a first specific value, wherein the first specific value is used to indicate that the maximum length value of the data packet transmitted in the subsequent communication is from the NFCC in the first NFC device Responsible for determining, and the value of the first parameter may be the default value of the NFCC in the first NFC device (ie, may be understood as a default value set in the NFCC when the NFC chip is shipped), or may be the DH of the first NFC device. The value of the NFCC configured for the first NFC device is not limited in the embodiment of the present invention.

For example, for the NFC-DEP protocol, it is assumed that the first parameter is PN_NFC_DEP_LENGTH, which is 1 byte (ie, octet octet), and the first specific value is 0x00 (of course, other values may be used, here is only an example) When the value of PN_NFC_DEP_LENGTH is 0x00, it indicates that the maximum length value of the data packet transmitted in the subsequent communication is determined by the NFCC in the first NFC device, that is, the NFCC can determine to adjust the maximum length value according to conditions such as its own capability. The value of the first parameter PN_NFC_DEP_LENGTH may be set to a default value when the NFC chip is shipped from the factory. If the default value is the first specific value, the NFCC of the first NFC device is responsible for determining the transmission in the subsequent communication. The maximum length value of the data packet. Otherwise, the NFCC of the first NFC device cannot determine the maximum length value. Of course, the DH can configure (ie, modify) the first NFCC through a parameter configuration command (eg, CORE_SET_CONFIG_CMD) defined in the NCI specification. The value of the parameter.

Optionally, determining, by the NFCC of the second NFC device, whether the NFCC of the second NFC device is responsible for responding to the foregoing first request may include:

Determining whether a value of the second parameter in the NFCC of the second NFC device is a second specific value, where The second specific value is used to indicate that the NFCC of the second NFC device is responsible for responding to the first request, and the second specific value may be a default value of the NFCC of the second NFC device, or may be a DH of the second NFC device. The value of the NFCC configured for the second NFC device is not limited in the embodiment of the present invention.

For example, for the NFC-DEP protocol, it is assumed that the second parameter is LN_NFC_DEP_LENGTH, which is 1 byte (ie, octet octet), and the second specific value is 0x00 (of course, it can be other values, here is only an example) When the value of LN_NFC_DEP_LENGTH is 0x00, it indicates that the maximum length value of the data packet transmitted in the subsequent communication is confirmed by the NFCC in the second NFC device, that is, the NFCC can process and respond to the first request according to conditions such as its own capability. The value of the second parameter LN_NFC_DEP_LENGTH may be set to a default value when the NFC chip is shipped from the factory. If the default value is the second specific value, the NFCC of the second NFC device is responsible for confirming the transmission in the subsequent communication. The maximum length value of the data packet. Otherwise, the NFCC of the second NFC device cannot determine the maximum length value. Of course, the DH can configure (ie, modify) the second NFCC through a parameter configuration command (eg, CORE_SET_CONFIG_CMD) defined in the NCI specification. The value of the parameter.

Optionally, after the NFCC of the second NFC device performs step S404 and when the first response is used to indicate that the second NFC device accepts to adjust the maximum length value of the data packet transmitted during the subsequent communication to the first length. The value of the NFCC of the second NFC device can also perform the following operations:

The first length value is sent to the DH of the second NFC device by the third notification.

Optionally, the first request may be a PSL_REQ defined in the Digital specification, and the first response and the second response may be PSL_RES defined in the Digital specification, and the first RF interface and the second RF interface may be NCI. The NFC-DEP radio interface is defined in the specification, and the first notification, the second notification, and the third notification may be the RF_INTF_ACTIVATED_NTF defined in the NCI specification, which is not limited in the embodiment of the present invention.

Optionally, the foregoing first request may be a RATS Command or an ATTRIB Command defined in the Digital specification, and the foregoing first response and the second response may be a RATS Response or an ATTRIB Response defined in the Digital specification, and the foregoing first RF interface and The foregoing second RF interface may be an ISO-DEP radio interface or an NDEF radio interface defined in the NCI specification, and the first notification, the second notification, and the third notification may be the RF_INTF_ACTIVATED_NTF defined in the NCI specification, and the implementation of the present invention The example is not limited.

It can be seen that the implementation of the embodiments of the present invention can implement the NFCC and the target party through the NCI specification. The NFC device adjusts the maximum length value of the communication packet during subsequent communication.

Referring to FIG. 5, FIG. 5 is a schematic flowchart diagram of another method for adjusting a data packet length in a near field communication NFC according to an embodiment of the present invention. The method shown in FIG. 5 is applied to the first NFC device as the initiator and the second NFC device as the target, wherein the first NFC device and the second NFC device are each composed of at least NFCC and DH, and the first The MAC layer is activated by both the NFC device and the second NFC device, that is, the first NFC device and the second NFC device have negotiated the maximum length value of the data packet transmitted in the subsequent communication process, that is, the second length, through the ATR_REQ and the ATR_RES. And a third length value, wherein the second length value is set by the first NFC device and is used to limit the length of the data packet sent by the second NFC device during the subsequent communication (ie, from the second NFC device to the first NFC device a length of the data packet transmitted in the direction), the third length value being set by the second NFC device and used to limit the length of the data packet sent by the first NFC device during the subsequent communication (ie, from the first NFC device to the second The length of the data packet transmitted in the direction of the NFC device, that is, in the subsequent communication, the length of the data packet sent by the second NFC device cannot exceed the second length value, and the length of the data packet sent by the first NFC device cannot be Exceeded the third length value. As shown in FIG. 5, the method for adjusting the packet length in the near field communication NFC may include the following steps:

S501. The DH of the first NFC device sends an adjustment command including a first length value to the NFCC of the first NFC device.

It should be noted that the adjustment command (eg, RF_LR_ADJUST_CMD or RF_LR_SWITCH_CMD) may be used in the RFST_DISCOVERY state, the RFST_W4_ALL_DISCOVERIES state, the RFST_W4_HOST_SELECT state, or the RFST_POLL_ACTIVE state defined by the NCI specification, and the format includes but is not limited to the formats shown in Tables 1 and 2 below.

Table 1: Adjustment command RF_LR_ADJUST_CMD

Table 2: Identification, length and value of parameters

标识IDIdentification ID	长度lenLength len	值valValue val
标识IDIdentification ID	长度lenLength len	值valValue val	0x000x00	1Octet1Octet	第一长度值First length value
0x01-0x7F0x01-0x7F		预留Reserved	0x000x00	1Octet1Octet	第一长度值First length value
0x01-0x7F0x01-0x7F		预留Reserved	0x80-0xFF0x80-0xFF		专用dedicated

In this embodiment, the first length value in the adjustment command may be a value determined by the DH of the first NFC device that is less than or equal to the second length value and the third length value. At this time, the NFCC of the first NFC device The radio interface activation notification including the first length value may be reported to the DH of the first NFC device before the step S501. Of course, whether the first length value does not exceed the second length value and the third length value may not pass the first The DH of an NFC device determines that the NFCC of the first NFC device may need to determine the length value itself after receiving the adjustment command.

S502. The NFCC of the first NFC device receives the foregoing adjustment command.

S503. The NFCC of the first NFC device sends a first request including a first length value to the NFCC of the second NFC device.

In the embodiment of the present invention, the first request is used to adjust a maximum length value of a data packet transmitted by the first NFC device and the second NFC device in a subsequent communication process to a first length value included in the first request, The first length value is less than or equal to the second length value and less than or equal to the third length value, and the first request may further include the first DID.

S504. The NFCC of the second NFC device receives the first request, and determines whether the NFCC of the second NFC device is responsible for responding to the first request.

In the embodiment of the present invention, when the determination result of step S504 is YES, the NFCC of the second NFC device Step S505 may be performed; when the determined result of step S504 is NO, the NFCC of the second NFC device may perform step S506.

S505. The NFCC of the second NFC device sends a first response to the first request to the NFCC of the first NFC device.

In this embodiment, the first response may include the second DID, and the sending, by the NFCC of the second NFC device, the first response to the first request to the NFCC of the first NFC device may include:

When the determination result is yes, sending, to the NFCC of the first NFC device, a first response for instructing the second NFC device to accept the maximum length value of the data packet transmitted in the subsequent communication process to be adjusted to the first length value, where The DID included in the first response is the same as the DID included in the first request, and the DID included in the first response and the DID included in the first request are both device identifiers of the second NFC device;

S506. The NFCC of the second NFC device activates the first RF interface on the second NFC device.

S507. The NFCC of the second NFC device sends a first notification including the foregoing first length value to the DH of the second NFC device.

S508. The DH of the second NFC device receives the first notification, and determines whether the first length value is less than or equal to the second length value and is less than or equal to the third length value.

In the embodiment of the present invention, when the determination result of step S508 is YES, the DH of the second NFC device may be To perform step S509; when the result of the determination in step S508 is NO, the DH of the second NFC device may return a response error message to the NFCC of the second NFC device.

S509. The DH of the second NFC device sends a second response to the NFCC of the second NFC device by using a data packet.

S510. The NFCC of the second NFC device sends the foregoing second response to the NFCC of the first NFC device.

S511. The NFCC of the first NFC device receives a response sent by the NFCC of the second NFC device.

S512. When the DID included in the response received by the NFCC of the first NFC device is the same as the DID included in the first request, the NFCC of the first NFC device uses the first length value as the data transmitted in the subsequent communication process. The maximum length of the packet.

S513. The NFCC of the first NFC device returns an adjustment response including a status indication and/or the first length value to the DH of the first NFC device.

In the embodiment of the present invention, the status indication is used to indicate that the NFCC of the first NFC device has adjusted the maximum value to the first length value, that is, the adjustment has been completed between the first NFC device and the second NFC device. .

As an optional implementation manner, before the DH of the first NFC device performs step S501, the NFCC of the first NFC device may further perform the following operations:

Activating a second RF interface on the first NFC device and transmitting a second notification to the DH of the first NFC device, wherein the second notification is used to notify the DH of the first NFC device of the second RF in the first NFC device The interface has been activated.

As another optional implementation manner, after performing step S502, before performing step S503, the NFCC of the first NFC device may further perform the following operations:

As an optional implementation manner, after the NFCC of the second NFC device performs step S505 and when the first response is used to indicate that the second NFC device accepts the transmission that will be transmitted during the subsequent communication When the maximum length value of the data packet is adjusted to the above first length value, the NFCC of the second NFC device can also perform the following operations:

As an optional implementation manner, the NFCC of the first NFC device first activates the foregoing first RF interface, and sends the first notification to the DH of the first NFC device, and then performs the step S501 by the DH of the first NFC device. In the case, after transmitting the adjustment response including the status indication and/or the first length value to the DH of the first NFC device, the NFCC of the first NFC device may also perform the following operations:

Receiving, by the foregoing second RF interface, the first data message sent by the DH of the first NFC device, and packaging the load in the first data message into the first data packet by using the first length value as the maximum length value, that is, the first data packet The length value of a data packet is less than or equal to the first length value;

The first data packet is sent to the NFCC of the second NFC device.

As an optional implementation manner, after the step S502 and before the step S503, the operation of determining that the first length value is less than or equal to the second length value and less than or equal to the third length value is performed. After the DH of the first NFC device sends an adjustment response including the status indication and/or the first length value, the NFCC of the first NFC device may also perform the following operations:

Sending a fourth notification to the DH of the first NFC device, the fourth notification is used to notify that the DH third RF interface of the first NFC device has been activated;

Receiving, by the third RF interface, the second data message sent by the DH of the first NFC device, and packaging the load in the second data message into the second data packet by using the first length value as the maximum length value;

The second data packet is sent to the NFCC of the second NFC device.

In the embodiment of the present invention, the foregoing fourth notification may include the first length value, or may not include; the first data message and the second data message, the first data packet, and the second data packet are compared with the foregoing embodiment. The data messages and data packets described above are the same, and are not described here. Optionally, the first request may be a PSL_REQ defined in the Digital specification, and the first response and the second response may be a PSL_RES defined in the Digital specification, the first RF interface, the second RF interface, and the foregoing The third RF interface may be an NFC-DEP radio interface defined in the NCI specification, and the first notification, the second notification, the third notification, and the fourth notification may be the RF_INTF_ACTIVATED_NTF defined in the NCI specification, and the embodiment of the present invention Not limited.

Optionally, the first request may be a RATS Command or an ATTRIB Command defined in the Digital specification, and the first response and the second response may be determined by the Digital specification. The first RF interface, the second RF interface, and the third RF interface may be an ISO-DEP radio interface or an NDEF radio interface defined in the NCI specification, and the foregoing first notification, the foregoing The second notification, the third notification, and the fourth notification may be the RF_INTF_ACTIVATED_NTF defined in the NCI specification, which is not limited in the embodiment of the present invention.

It can be seen that the embodiment of the present invention can implement the function of the first NFC device as the initiator through the NCI specification to adjust the maximum length value of the communication data packet in the subsequent communication process through the NFCC and the second NFC device as the target party.

Please refer to FIG. 6. FIG. 6 is a schematic structural diagram of an NFCC according to an embodiment of the present invention. Wherein, the NFCC is an NFCC in the first NFC device. As shown in FIG. 6, the NFCC may include a determining module 601, a communication module 602, and a determining module 603, where:

In an embodiment, the determining module 601 is configured to determine whether the NFCC is responsible for determining a maximum length value of the data packet transmitted in the subsequent communication, wherein the maximum length value limits the first NFC device to the second NFC device. The length of the data packet transmitted in the direction and respectively from the second NFC device to the first NFC device.

In the embodiment of the present invention, before the determining module 601 performs the corresponding operation, the first NFC device and the second NFC device have activated the MAC layer, that is, the first NFC device and the second NFC device have negotiated the ATR_REQ and the ATR_RES. The maximum length value of the data packet transmitted during the communication, that is, the second length value and the third length value, wherein the second length value is set by the first NFC device and is used to restrict the second NFC device from transmitting during the subsequent communication The length of the data packet (ie, the length of the data packet transmitted from the second NFC device to the direction of the first NFC device), the third length value being set by the second NFC device and used to limit the first NFC device in the subsequent communication process The length of the data packet sent in the middle (ie, the length of the data packet transmitted from the first NFC device to the second NFC device), that is, the length of the data packet sent by the second NFC device cannot exceed the length of the subsequent communication. The second length value, the length of the data packet sent by the first NFC device cannot exceed the third length value.

The communication module 602 is configured to: when the determination result of the determining module 601 is yes, send a first request including a first length value to the second NFC device, and receive a first response returned by the second NFC device for the first request, The first request is used to indicate that the maximum length value of the data packet transmitted by the first NFC device and the second NFC device in the subsequent communication is adjusted to a first length value, and the first length value is one determined by the NFCC. a value, the first request may further include a first DID and the first response may include The second DID.

The command and response may be commands and responses used for communication through the NFC-DEP protocol, such as DEP_REQ and DEP_RES. The commands and responses may be encapsulated in data as payloads (upper layer application related business data). In the Data, then the NFC-A technology (ie the type A RF technology defined in the NFC Forum, corresponding to the abbreviation of Type A of ISO/IEC 14443) standard frame format or NFC-F technology (ie NFC Forum) The defined type F radio frequency technology, corresponding to the abbreviation of the 212 kbps and 424 kbps communication mechanism of ISO/IEC 18092) is transmitted in the frame format. Therefore, the above maximum length value can be understood as the maximum value of the packet length, and can also be understood as the above command and response. The maximum number of payloads.

In the embodiment of the present invention, the communication module 602 sends a first request including the first length value to the second NFC device, so that the second NFC device does not accept the maximum length value of the data packet transmitted during the subsequent communication process to The first length value does not return any response, or the second NFC device returns a response indicating that the maximum length value of the data packet transmitted during the subsequent communication is not accepted to be adjusted to the first length value, for example, The DID included in the response is not equal to the DID included in the first request, to indicate that the second NFC device does not accept the first length value, or to cause the second NFC device to return to indicate acceptance in the subsequent communication process. The maximum length value of the transmitted data packet is adjusted to the response of the first length value, for example, the device identifier DID included in the response is equal to the DID included in the first request, to indicate that the second NFC device accepts the foregoing A length value.

The determining module 603 is configured to use the first length value as the maximum length value of the data packet transmitted in the subsequent communication when the first DID is the same as the second DID.

As an optional implementation manner, the determining module 601 determines whether the NFCC is responsible for determining the maximum length value of the data packet transmitted in the subsequent communication, and the specific manner may be:

As an optional implementation manner, the communication module 602 is further configured to send, to the DH of the first NFC device, a first notification that includes the foregoing first length value, where the first notification is used to notify the first NFC device The DH first RF interface has been activated and is also used to receive a data message sent by the DH of the first NFC device through the first RF interface.

In the optional implementation, the communication module 602 sends the foregoing first notification that includes the first length value to the DH of the first NFC device, and the purpose is to report the first NFC device and the second NFC to the DH of the first NFC device. The maximum length of the data packet transmitted in the subsequent communication after the device is adjusted is the first length value, so that the DH of the first NFC device can obtain the first length value and can be used in the upper layer service, for example, estimating. What is the time required to complete the transmission of the upper layer service related data in this communication, and the like, and the first RF interface of the first NFC device is notified that the first RF interface has been activated, that is, the communication module 602 is ready to receive the first A data message sent by the DH of the NFC device. The data message may be a Data Message(s) defined in the NCI specification, where the Data Message(s) is transmitted between the DH and the NFCC by transmitting the Data Packet(s), and the load in the data message is (payload) can carry data related to upper layer services.

In this alternative embodiment, the NFCC may further include a package module 604, and the NFCC including the package module 604 may be as shown in FIG. 7. FIG. 7 is a schematic structural diagram of another NFCC disclosed in the embodiment of the present invention. among them:

The encapsulating module 604 is configured to encapsulate the load in the data message into a data packet by using the first length value as the maximum length value.

In this optional implementation, the communication module 602 can also be configured to send the data packet to the second NFC device.

Optionally, the first request may be a PSL_REQ defined in the Digital specification, and the first response may be a PSL_RES defined in the Digital specification, and the first RF interface may be an NFC-DEP radio interface defined in the NCI specification, and The foregoing first notification may be a radio frequency interface activation notification RF_INTF_ACTIVATED_NTF defined in the NCI specification, which is not limited in the embodiment of the present invention.

Optionally, the foregoing first request may also be a RATS Command or an ATTRIB Command applicable to the ISO-DEP protocol defined in the Digital specification, where the FSDI (Frame Size for proximity Couple Device Integer) parameter is included for calculating work in polling. The maximum length value FSD of a data packet (for example, an information block I-block or a load payload of the I-block) acceptable to an NFC device (for example, a reader/writer) in a (poll) mode; correspondingly, the first response described above It may also be a RATS Response or an ATTRIB Response defined in the Digital specification, which may include a FSCI (Frame Size for proximity Card Integer) parameter for calculating an acceptable NFC device (eg, NFC tag or card emulation) operating in poll mode. The maximum length value FSC of the data packet (for example, the information block I-block or the load payload of the I-block); the first RF interface may be an ISO-DEP radio frequency interface or an NDEF radio frequency interface defined in the NCI specification, the first notification It can be RF_INTF_ACTIVATED_NTF as defined in the NCI regulations. In this case, the “adjustment” used in the solution of the present invention can be understood as a negotiation, a limitation, and the like in addition to the meaning of the present invention, and the present invention does not limit this.

Please refer to FIG. 8. FIG. 8 is a schematic structural diagram of another NFCC according to an embodiment of the present invention. Wherein, the NFCC is an NFCC in the first NFC device. As shown in FIG. 8, the NFCC may include a communication module. 801 and determining module 802, wherein:

The communication module 802 is configured to receive, by using the DH of the first NFC device, an adjustment command that includes a first length value, where the adjustment command is used to instruct the NFCC to adjust a maximum length value of the data packet transmitted during the subsequent communication, and the maximum The length value limits the length of the data packets respectively transmitted from the first NFC device to the second NFC device and from the second NFC device to the first NFC device.

In the embodiment of the present invention, before the communication module 801 performs the corresponding operation, the first NFC device and the second NFC device have activated the MAC layer, that is, the first NFC device and the second NFC device have negotiated the ATR_REQ and the ATR_RES. The maximum length value of the data packet transmitted during the communication, that is, the second length value and the third length value, wherein the second length value is set by the first NFC device and is used to restrict the second NFC device from transmitting during the subsequent communication The length of the data packet (ie, the length of the data packet transmitted from the second NFC device to the direction of the first NFC device), the third length value being set by the second NFC device and used to limit the first NFC device in the subsequent communication process The length of the data packet sent in the middle (ie, the length of the data packet transmitted from the first NFC device to the second NFC device), that is, the length of the data packet sent by the second NFC device cannot exceed the length of the subsequent communication. The second length value, the length of the data packet sent by the first NFC device cannot exceed the third length value.

The communication module 801 is further configured to send a first request that includes the first length value to the second NFC device, and receive a first response that is returned by the second NFC device for the first request, where the first request is used to indicate that The maximum length value of the data packet transmitted during the subsequent communication between the first NFC device and the second NFC device is adjusted to a first length value, the first request may further include a first DID, and the first response may include a second DID .

In the embodiment of the present invention, the communication module 801 sends a first request including the first length value to the second NFC device, so that the second NFC device does not accept the maximum length value of the data packet transmitted during the subsequent communication process to The first length value does not return any response, or the second NFC device returns a response indicating that the maximum length value of the data packet transmitted during the subsequent communication is not accepted to be adjusted to the first length value, for example, The DID included in the response is not equal to the DID included in the first request, to indicate that the second NFC device does not accept the first length value, or to cause the second NFC device to return to indicate acceptance in the subsequent communication process. The maximum length value of the transmitted data packet is adjusted to the response of the first length value, for example, the device identifier DID included in the response is equal to the DID included in the first request, to indicate that the second NFC device accepts the foregoing A length value.

The determining module 802 is configured to use the first length value as the maximum length value of the data packet transmitted in the subsequent communication when the first DID is the same as the second DID.

As an optional implementation manner, the communication module 801 can also be used to DH to the first NFC device. Transmitting an adjustment response including a status indication and/or the first length value, wherein the status indication is used to indicate that the NFCC has adjusted the maximum length value to the first length value, that is, the first NFC device and the second This adjustment has been completed between NFC devices.

As an optional implementation manner, when the communication module 801 is further configured to send an adjustment response including a status indication and/or the foregoing first length value to the DH of the first NFC device, the NFCC may further include the first activation module. 803, and the NFCC including the first activation module 803 can be as shown in FIG. 9, and FIG. 9 is a schematic structural diagram of another NFCC disclosed in the embodiment of the present invention. among them:

The first activation module 803 is configured to activate the first RF interface before the communication module 801 sends the first request including the first length value to the second NFC device.

The communication module 801 is further configured to send a first notification to the DH of the first NFC device, where the first notification is used to notify that the DH first RF interface of the first NFC device has been activated.

It should be noted that, in the optional implementation, the first NFC device and the second NFC device activate the MAC layer between the first NFC device and the second NFC device by using ATR_REQ and ATR_RES, that is, the first NFC device and The second NFC device has negotiated the maximum length value of the data packets respectively transmitted in the two directions in the subsequent communication, that is, the second length value and the third length value in the above embodiment. In the embodiment of the present invention, when the NFCC of the first NFC device sends the first notification to the DH of the first NFC device, the parameter value in the ATR_RES may be carried, including the third length value. For details, refer to the NCI specification.

As an optional implementation manner, when the communication module 801 is further configured to send, to the DH of the first NFC device, an adjustment response including a status indication and/or the first length value, and the NFCC includes the first activation module 803, the communication is performed. The module 801 is further configured to receive, by using the foregoing first RF interface, the first data message sent by the DH of the first NFC device.

In this optional embodiment, the NFCC further includes a first encapsulation module 804, and the NFCC including the first encapsulation module 804 can be as shown in FIG. 10, and FIG. 10 is another NFCC disclosed in the embodiment of the present invention. Schematic. among them:

The first encapsulating module 804 is configured to encapsulate the load in the first data message into the first data packet by using the first length value as the maximum length value.

And the communication module 801 is further configured to send the first data packet to the second NFC device.

As another optional implementation manner, when the communication module 801 is further configured to send an adjustment response including a status indication and/or the foregoing first length value to the DH of the first NFC device, the determining module 802 may also be in the communication module. The 801 sends a first request including the foregoing first length value to the second NFC device. Before, determining that the first length value is less than or equal to the second length value and less than or equal to the third length value.

In this optional implementation, the NFCC further includes a second encapsulation module 805 and a second activation module 806, and the NFCC including the second encapsulation module 805 and the second activation module 806 can be as shown in FIG. 11, FIG. 11 is Another schematic diagram of the structure of the NFCC disclosed in the embodiment of the present invention. among them:

The second activation module 806 is configured to activate the second RF interface.

The communication module 801 is further configured to send a second notification to the DH of the first NFC device, where the second notification is used to notify that the DH second RF interface of the first NFC device has been activated, and receive the first through the second RF interface. A second data message sent by the DH of an NFC device.

The second encapsulating module 805 is configured to encapsulate the load in the second data message into the second data packet by using the first length value as the maximum length value.

The communication module 801 is further configured to send the second data packet to the second NFC device.

It should be noted that, in the optional implementation manner, sending the foregoing adjustment command to the NFCC of the first NFC device by the DH of the first NFC device may occur before the first NFC device directly activates the MAC layer by using the NFCC and the second NFC device. Or after that, because the DH of the first NFC device does not know the specificity of the second length value and the third length value that the NFCC of the first NFC device and the second NFC device are about to negotiate or have negotiated, the first NFC device The first length value of the adjustment command sent by the DH may be greater than, equal to, or less than the second length value or the third length value. Then, the NFCC of the first NFC device prevents the first length value from exceeding the second length value or The third length value, the NFCC of the first NFC device needs to perform the above operation to ensure that the first length value is less than or equal to the second length value and the third length value.

It should be noted that, in the embodiment of the present invention, the second notification may include the first length value, or may not include; the first data message and the second data message, the first data packet and the second data packet, and The data messages and data packets described in the foregoing embodiments are the same, and are not described here.

Optionally, the first request may also be a RATS Command or an ATTRIB Command applicable to the ISO-DEP protocol defined in the Digital specification, and the FSDI (Frame Size for The proximity coupling Device Integer) parameter is used to calculate a packet acceptable to an NFC device (eg, a reader or the like) operating in a poll mode (eg, a block I-block or a load payload of the I-block). The maximum length value FSD; correspondingly, the first response may also be a RATS Response or an ATTRIB Response defined in the Digital specification, wherein the FSCI (Frame Size for proximity Card Integer) parameter may be included for calculating the operation in the poll mode. The maximum length value FSC of a data packet (eg, an information block I-block or a load payload of the I-block) that can be accepted by an NFC device (eg, an NFC tag or card emulation); the first RF interface described above and the above may be defined in the NCI specification The first notification and the second notification described above may be RF_INTF_ACTIVATED_NTF defined in the NCI specification for the ISO-DEP radio interface or the NDEF radio interface. In this case, the “adjustment” used in the solution of the present invention can be understood as a negotiation, a limitation, and the like in addition to the meaning of the present invention, and the present invention does not limit this.

Please refer to FIG. 12. FIG. 12 is a schematic structural diagram of still another NFCC according to an embodiment of the present invention. As shown in FIG. 12, the NFCC may include at least one processor 1201, such as a CPU, a communication device 1202, and at least one communication bus 1203. And the first NFC device and the second NFC device have activated the MAC layer, that is, the first NFC device and the second NFC device have negotiated the maximum length value of the data packet transmitted in the subsequent communication process through the ATR_REQ and the ATR_RES, that is, the first a second length value and a third length value, wherein the second length value is set by the first NFC device and is used to limit the length of the data packet sent by the second NFC device during the subsequent communication (ie, from the second NFC device to the first The length of the data packet transmitted in the NFC device direction), the third length value being set by the second NFC device and used to limit the length of the data packet sent by the first NFC device during the subsequent communication (ie, from the first NFC device to The length of the data packet transmitted in the direction of the second NFC device, that is, the length of the data packet sent by the second NFC device in the subsequent communication cannot exceed the second length value, and the length of the data packet sent by the first NFC device Cannot exceed the third length value. among them:

Communication bus 1203 is used to implement connection communication between these components.

In one embodiment, the processor 1201 is configured to determine whether the NFCC is responsible for determining the maximum length value of the data packet transmitted in the subsequent communication.

The communication device 1202 is configured to: when the determination result of the processor 1201 is YES, send a first request including a first length value to the second NFC device, and receive a first response returned by the second NFC device for the first request, where The first request is used to indicate that the maximum length value of the data packet transmitted by the first NFC device and the second NFC device in the subsequent communication is adjusted to a first length value, where the first length value is a value determined by the NFCC, and The maximum length value limits the length of the data packet respectively transmitted from the first NFC device to the second NFC device direction and from the second NFC device to the first NFC device direction, and the first request may further include the first DID And the second response includes a second DID.

Specifically, as shown in FIG. 12, the communication device 1202 may include a first communication sub-device 12021 for communicating with the second NFC device (ie, transmitting data to and receiving data from the second NFC device), such as The transceiver circuit in the NFCC, etc., the operating frequency of the NFC antenna in the transceiver circuit may be 13.56 MHz, and the NFCC may send data to the second NFC device through the NFC antenna, or may receive data from the second NFC device. In the embodiment of the present invention, the communication device 1202 may send the first request including the first length value to the second NFC device by using the first communication sub-device 12021 and receive the first response returned by the second NFC device for the first request.

The processor 1201 is further configured to: when the first DID is the same as the second DID, use the first length value as the maximum length value of the data packet transmitted in the subsequent communication.

As an optional implementation manner, the processor 1201 determines whether the NFCC is responsible for determining the maximum length value of the data packet transmitted in the subsequent communication:

Determining whether the value of the first parameter is a first specific value, wherein the first specific value is used to indicate that the maximum length value of the data packet transmitted in the subsequent communication is determined by the NFCC, and the value of the first parameter is the default of the NFCC. The value (ie, can be understood as the default value set to the NFCC when the NFC chip is shipped), or the value assigned to the NFCC by the DH of the first NFC device.

As an optional implementation, the communication device 1202 is further configured to send, to the DH of the first NFC device, a first notification that includes a first length value, where the first notification is used to notify the DH of the first NFC device. The first RF interface is activated, and the data message sent by the first NFC device is received by the first RF interface, and the processor 1201 is further configured to encapsulate the load in the data message by using the first length value as the maximum length value. The data packet, the communication device 1202 is further configured to send the data packet to the second NFC device by using the first communication sub-device 12021.

In the optional implementation manner, the communication device 1202 sends the first notification that includes the foregoing first length value to the DH of the first NFC device, and the first notification is to report the first NFC configuration to the DH of the first NFC device. The maximum length of the data packet transmitted in the subsequent communication adjusted by the second NFC device is the first length value, so that the DH of the first NFC device obtains the first length value and can be performed in the upper layer service. Using, for example, estimating the time required to complete the transmission of the upper layer service related data in the current communication, and the like, and notifying the DN of the first NFC device that the first RF interface has been activated, that is, the first NFC device The NFCC is ready to receive the data message sent by the DH of the first NFC device. The data message may be a Data Message(s) defined in the NCI specification, where the Data Message(s) is transmitted between the DH and the NFCC by transmitting the Data Packet(s), and the load in the data message is (payload) can carry data related to upper layer services.

Specifically, as shown in FIG. 12, the communication device 1202 may further include a second communication sub-device 12022 for communicating with the DH of the first NFC device, such as an interface between the DH and the NFCC, which may support the NCI at the upper layer. The protocol can transmit data at the bottom layer using a Universal Asynchronous Receiver/Transmitter (UART), an I2C bus (Inter-Integrated Circuit), or a Half-Duplex Serial Peripheral Interface (SPI). In the embodiment of the present invention, the communication device 1202 sends a first notification including the first length value to the DH of the first NFC device through the second communication sub-device 12022, and receives the data message sent by the DH through the second communication sub-device 12022, that is, The first RF interface described above can be understood as the second communication sub-device 12022.

It should be noted that, in the embodiment of the present invention, the data message and the data packet are the same as the data message and the data packet described in the foregoing embodiments, and details are not described herein again.

Optionally, the foregoing first request may also be a RATS Command or an ATTRIB Command applicable to the ISO-DEP protocol defined in the Digital specification, where the FSDI (Frame Size for proximity Couple Device Integer) parameter is included for calculating work in polling. The maximum length value FSD of a data packet (for example, an information block I-block or a load payload of the I-block) acceptable to an NFC device (for example, a reader/writer) in a (poll) mode; correspondingly, the first response described above It may also be a RATS Response or an ATTRIB Response defined in the Digital specification, which may include a FSCI (Frame Size for proximity Card Integer) parameter for calculating an acceptable NFC device (eg, NFC tag or card emulation) operating in poll mode. Packet (such as information block I-block or the I-block) The maximum length value FSC of the load payload; the first RF interface may be an ISO-DEP radio interface or an NDEF radio interface defined in the NCI specification, and the first notification may be RF_INTF_ACTIVATED_NTF defined in the NCI specification. In this case, the “adjustment” used in the solution of the present invention can be understood as a negotiation, a limitation, and the like in addition to the meaning of the present invention, and the present invention does not limit this.

In another embodiment, the communication device 1202 is configured to receive, by the DH of the first NFC device, an adjustment command that includes a first length value, where the adjustment command is used to instruct the NFCC to adjust the data packet transmitted during the subsequent communication process. The maximum length value.

Specifically, the communication device 1202 may include a second communication sub-device 12022 for communicating with the DH of the first NFC device, such as an interface between the DH and the NFCC, the interface may support the NCI protocol at the upper layer, and may be used at the bottom layer. The data is transmitted by an asynchronous transceiver (UART, Universal Asynchronous Receiver/Transmitter), an I2C bus (Inter-Integrated Circuit), or a half-duplex serial peripheral interface (SPI). In the embodiment of the present invention, the communication device 1202 may receive, by using the second communication sub-device 12022, an adjustment command including a first length value sent by the DH of the first NFC device.

The communication device 1202 is further configured to send a first request including the foregoing first length value to the second NFC device, and receive a first response returned by the second NFC device for the first request, where the first request is used to indicate Adjusting a maximum length value of the data packet transmitted during the subsequent communication between the first NFC device and the second NFC device to a first length value, the first request may further include a first DID, and the first response further includes a second DID .

Specifically, the communication device 1202 may further include a first communication sub-device 12021 for communicating with the second NFC device (ie, transmitting data to and receiving data from the second NFC device), such as a transceiver circuit in the NFCC. The operating frequency of the NFC antenna in the transceiver circuit may be 13.56 MHz. The NFCC may send data to the second NFC device through the NFC antenna, or may receive data from the second NFC device. In the embodiment of the present invention, after receiving the adjustment command including the first length value sent by the DH of the first NFC device, the communication device 1202 may send, by using the first communication sub-device 12021, the first length value to the second NFC device. The first request and receive a first response returned by the second NFC device for the first request.

The processor 1201 is configured to use the first length value as the maximum length value of the data packet transmitted in the subsequent communication when the first DID is the same as the second DID.

As an optional implementation manner, the communication device 1202 can also be used to install the second communication device. The setting 12022 sends an adjustment response including a status indication and/or the first length value to the DH of the first NFC device, the status indication indicating that the NFCC has adjusted the maximum length value to the first length value.

As an optional implementation manner, when the communication device 1202 is further configured to send, by the second communication sub-device 12022, an adjustment response including a status indication and/or the first length value to the DH of the first NFC device, the processor 1201. The first RF interface can also be activated before the first communication sub-device 12021 of the communication device 1202 sends the first request including the first length value to the second NFC device. The communication device 1202 is further configured to send a first notification to the DH of the first NFC device, where the first notification is used to notify the DH that the first RF interface has been activated. Specifically, the communication device 1202 can pass the second communication. The child device 12022 sends a first notification to the DH of the first NFC device.

In the optional implementation, the communication device 1202 is further configured to receive, by using the first RF interface, the first data message sent by the DH of the first NFC device, where the processor 1201 is further configured to The first length value is used as the maximum length value to encapsulate the load in the first data message into the first data packet. The communication device 1202 is further configured to send the first data packet to the second by the first communication sub-device 12021. NFC device.

As another optional implementation manner, when the communication device 1202 is further configured to send, by the second communication sub-device 12022, an adjustment response including a status indication and/or the first length value to the DH of the first NFC device, the processing is performed. The device 1201 is further configured to: before the first communication sub-device 12021 of the communication device 1202 sends the first request including the first length value to the second NFC device, determine that the first length value is less than or equal to the second length value and is less than Or equal to the above third length value.

In the optional implementation, the communication device 1202 is further configured to send, by the second communication sub-device 12022, a second notification to the DH of the first NFC device, where the second notification is used to notify the first The second RF interface of the NFC device DH has been activated, and receives the second data message sent by the first NFC device DH through the second RF interface. The processor 1201 is further configured to use the first length value as the maximum length value. The load in the two data messages is encapsulated into a second data packet; the communication device 1202 is further configured to send the second data packet to the second NFC device by using the first communication sub-device 12021.

It should be noted that, in the embodiment of the present invention, the second notification may include the first length value, or may not include; the first data message and the second data message, the first data packet and the second data packet, and The data messages and data packets described in the foregoing embodiments are the same, and are not described here. Optionally, the first request may be a PSL_REQ defined in the Digital specification, the first response may be a PSL_RES defined in the Digital specification, and the first RF interface and the second RF interface may be an NCI. The NFC-DEP radio interface is defined in the specification, and the first notification and the second notification may be the radio interface activation notification RF_INTF_ACTIVATED_NTF defined in the NCI specification, which is not limited in the embodiment of the present invention.

Optionally, the foregoing first request may also be a RATS Command or an ATTRIB Command applicable to the ISO-DEP protocol defined in the Digital specification, where the FSDI (Frame Size for proximity Couple Device Integer) parameter is included for calculating work in polling. The maximum length value FSD of a data packet (for example, an information block I-block or a load payload of the I-block) acceptable to an NFC device (for example, a reader/writer) in a (poll) mode; correspondingly, the first response described above It may also be a RATS Response or an ATTRIB Response defined in the Digital specification, which may include a FSCI (Frame Size for proximity Card Integer) parameter for calculating an acceptable NFC device (eg, NFC tag or card emulation) operating in poll mode. The maximum length value FSC of the data packet (for example, the information block I-block or the load payload of the I-block); the first RF interface and the second RF interface may be an ISO-DEP radio frequency interface or an NDEF radio frequency defined in the NCI specification. The interface, the first notification and the second notification may be RF_INTF_ACTIVATED_NTF defined in the NCI specification. In this case, the “adjustment” used in the solution of the present invention can be understood as a negotiation, a limitation, and the like in addition to the meaning of the present invention, and the present invention does not limit this.

Please refer to FIG. 13. FIG. 13 is a schematic structural diagram of a system for adjusting a data packet length in a near field communication NFC according to an embodiment of the present invention. As shown in FIG. 13, the system may include a first NFC device 1301 as an initiator and a second NFC device 1302 as a target, wherein the first NFC device 1301 may include a first NFCC 13011 and a first DH 13012, a second NFC The device 1302 may include a second NFCC 13021 and a second DH 13022, and the first NFC device 1301 and the second NFC device 1302 have activated the MAC layer, that is, the first NFC device 1301 and the second NFC device 1302 have negotiated with the ATR_RES through the ATR_REQ. The maximum length value of the data packet transmitted during the subsequent communication, that is, the second length value and the third length value, wherein the second length value is set by the first NFC device 1301 and is used to limit the second NFC device 1302 in subsequent communication. The length of the data packet sent in the process, the third length value being set by the second NFC device 1302 and used to limit the first NFC device 1301 in the subsequent communication process The length of the sent packet is:

In one embodiment, the first NFCC 13011 is configured to determine whether the first NFCC 13011 is responsible for determining the maximum length value of the data packet transmitted in the subsequent communication, and if so, transmitting the first NFCC 13021 to the second NFC device 1302 to include the first a first request of the length value, wherein the first request is used to indicate that the maximum length value of the data packet transmitted by the first NFC device 1301 and the second NFC device 1302 in the subsequent communication is adjusted to a first length value, where The first length value is a value determined by the first NFCC 13011, and the first request may further include the first DID.

The second NFCC 13021 is configured to determine whether the second NFCC 13021 is responsible for responding to the first request, and when the determination result is yes, send a first response to the first request to the first NFCC 13011, and when the determination result is no, activate the second The first RF interface on the NFC device 1302 transmits a first notification including the first length value to the second DH 13022.

The second DH 13022 is configured to determine, when the first notification is received, whether the first length value in the first notification is less than or equal to the second length value and is less than or equal to the third length value, when the determination result is yes At the time, a second response is returned to the second NFCC 13021.

The second NFCC 13021 is further configured to send the second response to the first NFCC 13011 after receiving the second response.

The first NFCC 13011 is further configured to: when receiving the response returned by the second NFCC 13021 and when the second DID included in the response is the same as the first DID included in the first request, using the first length value as the first NFC device The maximum length value of the data packet transmitted by the 1301 and the second NFC device 1302 in the subsequent communication, wherein the response is the first response or the second response.

As an optional implementation manner, the specific manner in which the first NFCC 13011 determines whether the first NFCC 13011 is responsible for determining the maximum length value of the data packet transmitted in the subsequent communication may be:

Determining whether the value of the first parameter is a first specific value, wherein the first specific value is used to indicate that the maximum length value of the data packet transmitted in the subsequent communication is determined by the first NFCC 13011, and the value of the first parameter is the first The default value of the NFCC 13011 (that is, it can be understood as the default value set in the NFCC when the NFC chip is shipped), or the value assigned to the first NFCC 13011 by the first DH 13012, is not limited in the embodiment of the present invention.

As an optional implementation manner, the first NFCC 13011 may be further configured to use the first length value as the maximum length value of the data packet transmitted by the first NFC device 1301 and the second NFC device 1302 in subsequent communications, Transmitting, to the first DH 13012, a second notification including the first length value described above, The second notification is used to notify the first DH 13012 that the second RF interface of the first NFC device 1301 has been activated, and receives the data message sent by the first DH 13012 through the second RF interface, and the first length value is used as the maximum. The length value encapsulates the payload in the data message into a data packet and sends the data packet to the second NFCC 1321 of the second NFC device 1302, wherein the data packet has a length value less than or equal to the third length value.

In the optional implementation manner, the first NFCC 13011 sends the foregoing second notification that includes the foregoing first length value to the first DH 13012. The purpose of the first NFCC 13011 is to report the first NFC device 1301 and the second NFC device 1302 to the first DH 13012. The maximum length of the data packet transmitted in the subsequent communication is the first length value, so that the first DH 13012 can obtain the first length value and can be used in the upper layer service, for example, estimating the upper layer in the current communication. What is the time required for the transmission of the service related data, and the like, and notifying the first DH 13012 that the above second RF interface has been activated, that is, the first NFCC 13011 is ready to receive the data message transmitted by the first DH 13012. The data message may be a Data Message(s) defined in the NCI specification, where the Data Message(s) is transmitted between the first DH 13012 and the first NFCC 13011 by transmitting the Data Packet(s), and the data is implemented. The payload in the message may carry data related to the upper layer service.

As an optional implementation manner, the specific manner in which the second NFCC 13021 determines whether the second NFCC 13021 is responsible for responding to the foregoing first request may be:

Determining whether the value of the second parameter in the second NFCC 13021 is a second specific value, wherein the second specific value is used to indicate that the second NFCC 13021 is responsible for responding to the first request, and the second specific value may be the second NFCC 13021 The default value (that is, it can be understood as the default value set in the NFCC when the NFC chip is shipped from the factory), or the value assigned to the second NFCC 13021 by the second DH 13022, which is not limited in the embodiment of the present invention.

As an optional implementation manner, the second NFCC 13021 may be further configured to: after the first response to the first request is sent to the first NFCC 13011, and the first DID included in the first response is included in the first request When the second DIDs are the same, the first length value is sent to the second DH 13022 through the third notification.

Optionally, the first request may be a PSL_REQ defined in the Digital specification, and the first response and the second response may be a PSL_RES defined in the Digital specification, where the first RF interface is The foregoing second RF interface may be an NFC-DEP radio interface defined in the NCI specification, and the first notification, the second notification, and the third notification may be the RF_INTF_ACTIVATED_NTF defined in the NCI specification, which is not limited in the embodiment of the present invention.

In another embodiment, the first NFCC 13011 is configured to receive an adjustment command that is sent by the first DH 13012 and includes a first length value, where the adjustment command is used to instruct the first NFCC 13011 to adjust a maximum of data packets transmitted during a subsequent communication. a length value, if yes, transmitting a first request including a first length value to the second NFCC 13021, wherein the first request is for indicating a data packet transmitted in a subsequent communication between the first NFC device 1301 and the second NFC device 1302 The maximum length value is adjusted to a first length value, and the first request may further include a first DID.

The first NFCC 13011 is further configured to receive the response returned by the second NFCC 13021 and when the second DID included in the response is the same as the first DID included in the first request, the first length value is used as the first NFC device 1301 The maximum length value of the data packet transmitted by the second NFC device 1302 in the subsequent communication, wherein the response is the first response or the second response.

As an optional implementation manner, the first NFCC 13011 may be further configured to: after the foregoing first length value is used as a maximum length value of the data packet transmitted in the subsequent communication process, to the first DH 13012 And transmitting an adjustment response including a status indication and/or the first length value, the status indication indicating that the first NFCC 13011 has adjusted the maximum length value to the first length value.

As an optional implementation manner, when the first NFCC 13011 is further configured to send the first length value as the maximum length value of the data packet transmitted in the subsequent communication process, the first DH 13012 is sent with the status indication and/or Or the first NFCC 13011 may be configured to activate the second RF interface on the first NFC device 1301 before receiving the adjustment command including the first length value sent by the first DH 13012, and The first DH 13011 sends a second notification for informing the first DH 13011 that the second RF interface has been activated.

In the optional implementation, the first NFCC 13011 is further configured to receive, by using the foregoing second RF interface, the first data message sent by the first DH 13012, where the first length value is used as the maximum length value. The load in the first data message is encapsulated into a first data packet, and the first data packet is sent to the second NFCC 13022 of the second NFC device 1302, where a maximum length value of the first data packet is less than or equal to the foregoing A length value.

As another optional implementation manner, the first NFCC 13011 may be further configured to: before sending the foregoing first request to the second NFCC 13021, determining that the first length value is less than or equal to the second length value and less than or equal to the third Length value.

In this optional embodiment, further optionally, the first NFCC 13011 is further configured to send a third notification to the first DH 13012, where the third notification is used to notify the first DH 13012 that the third RF interface has been activated, and Receiving, by the third RF interface, the second data message sent by the first DH 13012, using the first length value as the maximum length value to encapsulate the load in the second data message into a second data packet, and sending the second data packet In the second NFCC 13021 of the second NFC device 1302, wherein the length value of the second data packet is less than or equal to the first length value.

Determining whether the value of the first parameter in the second NFCC 13021 is a first specific value, wherein the first specific value is used to indicate that the second NFCC 13021 is responsible for responding to the first request, and the second specific value may be the second NFCC 13021 The default value (that is, it can be understood as the default value set in the NFCC when the NFC chip is shipped from the factory), or the value assigned to the second NFCC 13021 by the second DH 13022, which is not limited in the embodiment of the present invention.

It should be noted that, in the embodiment of the present invention, the first parameter, the first specific value, and the foregoing The first parameter, the first specific value in the embodiment may be different. In addition, the third notification may include the first length value, or may not include; the first data message and the second data message, the first data packet and the second data packet, and the data message described in the foregoing embodiment, The data packets are the same, and will not be described here.

As an optional implementation manner, the second NFCC 13021 may be further configured to: after the first response to the first request is sent to the first NFCC 13011, and the second DID included in the first response is included in the first request When the first DIDs are the same, the first length value is sent to the second DH 13022 through the fourth notification.

As an optional implementation manner, the first request may be a PSL_REQ defined in the Digital specification, and the first response and the second response may be a PSL_RES defined in the Digital specification, the first RF interface, and the second The RF interface and the foregoing third RF interface may be an NFC-DEP radio interface defined in the NCI specification, and the first notification, the second notification, the third notification, and the fourth notification may be RF_INTF_ACTIVATED_NTF defined in the NCI specification, and the implementation of the present invention The example is not limited.

As another optional implementation manner, the foregoing first request may be a RATS Command or an ATTRIB Command defined in the Digital specification, and the first response and the second response may be a RATS Response or an ATTRIB Response defined in the Digital specification. The first RF interface, the second RF interface, and the third RF interface may be an ISO-DEP radio interface or an NDEF radio interface defined in the NCI specification, and the first notification, the second notification, the third notification, and the foregoing The foregoing fourth notification may be the RF_INTF_ACTIVATED_NTF defined in the NCI specification, which is not limited in the embodiment of the present invention.

It can be seen that the embodiment of the present invention can implement the function of the first NFC device as the initiator through the NCI specification to adjust the maximum length value of the communication data packet in the subsequent communication process through the NFCC and the second NFC device as the target party. It should be noted that, in the above embodiments, the descriptions of the various embodiments are different, and the parts that are not described in detail in a certain embodiment may be referred to the related descriptions of other embodiments. In addition, those skilled in the art should also understand that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily required by the present invention.

The steps in the method of the embodiment of the present invention may be sequentially adjusted, merged, and deleted according to actual needs.

The modules in the NFCC of the embodiment of the present invention may be combined, divided, and deleted according to actual needs.

The module in the embodiment of the present invention may be implemented by a general-purpose integrated circuit, such as a CPU (Central Processing Unit) or an ASIC (Application Specific Integrated Circuit).

A person skilled in the art can understand that all or part of the process of implementing the above embodiment method can be completed by a computer program to instruct related hardware, and the program can be stored in a computer readable storage medium. When executed, the flow of an embodiment of the methods as described above may be included. The storage medium may be a magnetic disk, an optical disk, a read-only memory (ROM), or a random access memory (RAM).

The method, device and system for adjusting the data packet length in the near field communication NFC disclosed in the embodiment of the present invention are described in detail. The principles and implementation manners of the present invention are described in the specific examples. The description is only for helping to understand the present invention and its core ideas; at the same time, for those skilled in the art, according to the idea of the present invention, there will be changes in the specific embodiments and application scopes. The contents of this specification are not to be construed as limiting the invention.

Claims

A method for adjusting a data packet length in a near field communication NFC, the method comprising:

The NFCC of the first NFC device determines whether the NFCC is responsible for determining the maximum length value of the data packet transmitted in the subsequent communication;

If the NFCC is responsible for determining the maximum length value of the data packet transmitted in the subsequent communication, the NFCC sends a first request including the first length value to the second NFC device, the first request is used to indicate that The maximum length value of the data packet transmitted by the first NFC device and the second NFC device in the subsequent communication is adjusted to the first length value, and the first request further includes a first device identifier DID, where The first length value is a value determined by the NFCC;

The NFCC receives a first response returned by the second NFC device for the first request, and the first response includes a second DID;

If the first DID is the same as the second DID, the NFCC uses the first length value as the maximum length value of the data packet transmitted in the subsequent communication.
The method according to claim 1, wherein said determining whether said NFCC is responsible for determining a maximum length value of a data packet transmitted in a subsequent communication comprises:

Determining whether the value of the first parameter is a first specific value, wherein the first specific value is used to indicate that a maximum length value of the data packet transmitted in the subsequent communication is determined by the NFCC, wherein the value of the first parameter Is the default value of the NFCC, or is the value assigned to the NFCC by the host DH of the first NFC device.
The method of claim 1 further comprising:

Transmitting, by the NFCC, a first notification that includes the first length value to a DH of the first NFC device, where the first notification is used to notify that the DH first radio frequency RF interface has been activated;

Receiving, by the NFCC, the data message sent by the DH by using the first RF interface, and encapsulating the load in the data message into a data packet by using the first length value as the maximum length value;

The NFCC sends the data packet to the second NFC device.
The method of claim 2, wherein the method further comprises:

The NFCC sends a first notification including the first length value to the DH, where the first notification is used to notify the DH that the first radio frequency RF interface has been activated;

Receiving, by the NFCC, the data message sent by the DH by using the first RF interface, and encapsulating the load in the data message into a data packet by using the first length value as the maximum length value;

The NFCC sends the data packet to the second NFC device.
The method according to any one of claims 1 to 4, wherein the method further comprises:

If the NFCC is not responsible for determining the maximum length value of the data packet transmitted in the subsequent communication, the NFCC does not send the first request including the first length value to the second NFC device.
The method according to claim 3 or 4, wherein the first request is a parameter selection request PSL_REQ defined in the Digital specification;

The first response is a parameter selection response PSL_RES defined in the Digital specification;

The first RF interface is a near field communication data exchange protocol NFC-DEP radio frequency interface defined in an NFC controller interface NCI specification;

The first notification is a radio frequency interface activation notification RF_INTF_ACTIVATED_NTF defined in the NCI specification.
A method for adjusting a data packet length in a near field communication NFC, the method comprising:

The NFCC of the first NFC device receives an adjustment command including a first length value sent by the DH of the first NFC device, where the adjustment command is used to instruct the NFCC to adjust a maximum length value of a data packet transmitted during a subsequent communication process. ;

Sending, by the NFCC, a first request including the first length value to a second NFC device, where the first request is used to indicate that the first NFC device is transmitted during subsequent communication with the second NFC device The maximum length value of the data packet is adjusted to the first length value, and the first request further includes a first DID;

The NFCC receives a first response returned by the second NFC device for the first request, and the first response includes a second DID;

If the first DID is the same as the second DID, the NFCC uses the first length value as the maximum length value of the data packet transmitted in the subsequent communication.
The method of claim 7, wherein the method further comprises:

The NFCC sends an adjustment response including a status indication and/or the first length value to the DH, the status indication indicating that the NFCC has adjusted the maximum length value to the first length value.
The method according to claim 8, wherein before the receiving the adjustment command including the first length value sent by the DH of the first NFC device, the method further includes:

The NFCC activates a first RF interface and sends a first notification to the DH, the first notification being used to inform the DH that the first RF interface has been activated.
The method according to claim 8, wherein before the sending the first request including the first length value to the second NFC device, the method further comprises:

The NFCC determines that the first length value is less than or equal to a second length value and less than or equal to a third length value.
The method of claim 9 wherein the method further comprises:

The NFCC receives the first data message sent by the DH by using the first RF interface, and encapsulates the load in the first data message into the first data by using the first length value as the maximum length value. package;

The NFCC sends the first data packet to the second NFC device.
The method of claim 10, wherein the method further comprises:

The NFCC sends a second notification to the DH, where the second notification is used to notify that the DH second RF interface has been activated;

Receiving, by the NFCC, the second data message sent by the DH by using the second RF interface, and encapsulating the load in the second data message into the second data by using the first length value as the maximum length value Package

The NFCC sends the second data packet to the second NFC device.
The method according to claim 9, wherein said first request is PSL_REQ defined in the Digital specification;

The first response is a PSL_RES defined in the Digital specification;

The first RF interface is an NFC-DEP radio frequency interface defined in an NCI specification;

The first notification is RF_INTF_ACTIVATED_NTF defined in the NCI specification.
An NFCC, wherein the NFCC is an NFCC in a first NFC device, the NFCC includes a judging module, a communication module, and a determining module, where:

The determining module is configured to determine whether the NFCC is responsible for determining a maximum length value of the data packet transmitted in the subsequent communication;

The communication module is configured to: when the determination result of the determining module is yes, send a first request including a first length value to the second NFC device, and receive the second NFC device to return for the first request a first response, the first request is used to indicate that a maximum length value of a data packet transmitted by the first NFC device and the second NFC device in a subsequent communication is adjusted to the first length value, and The first request further includes a first DID, the first response includes a second DID, and the first length value is a value determined by the NFCC;

The determining module is configured to use the first length value as a maximum length value of a data packet transmitted in a subsequent communication when the first DID is the same as the second DID.
The NFCC according to claim 14, wherein the determining module determines whether the NFCC is responsible for determining the maximum length value of the data packet transmitted in the subsequent communication:

Determining whether the value of the first parameter is a first specific value, wherein the first specific value is used to indicate that a maximum length value of the data packet transmitted in the subsequent communication is determined by the NFCC, wherein the value of the first parameter Is the default value of the NFCC, or is the value assigned to the NFCC by the DH of the first NFC device.
The NFCC according to claim 14, wherein said communication module is further used for Transmitting, to the DH of the first NFC device, a first notification that includes the first length value, the first notification is used to notify the DH that the first radio frequency RF interface has been activated, and passes the first RF interface Receiving a data message sent by the DH;

The NFCC also includes a package module, wherein:

The encapsulating module is configured to encapsulate the load in the data message into a data packet by using the first length value as the maximum length value;

The communication module is further configured to send the data packet to the second NFC device.
The NFCC according to claim 15, wherein the communication module is further configured to send a first notification including the first length value to the DH, where the first notification is used to notify the DH An RF RF interface has been activated, and receives the data message sent by the DH through the first RF interface;

The NFCC also includes a package module, wherein:

The encapsulating module is configured to encapsulate the load in the data message into a data packet by using the first length value as the maximum length value;

The communication module is further configured to send the data packet to the second NFC device.
The NFCC according to claim 16 or 17, wherein said first request is PSL_REQ defined in the Digital specification;

The first response is a PSL_RES defined in the Digital specification;

The first RF interface is an NFC-DEP radio frequency interface defined in an NCI specification;

The first notification is RF_INTF_ACTIVATED_NTF defined in the NCI specification.
An NFCC, characterized in that the NFCC is an NFCC in a first NFC device, the NFCC comprising a communication module and a determining module, wherein:

The communication module is configured to receive an adjustment command including a first length value sent by the DH of the first NFC device, where the adjustment command is used to instruct the NFCC to adjust a maximum length of a data packet transmitted during a subsequent communication process. value;

The communication module is further configured to send a first request that includes the first length value to a second NFC device, and receive a first response that is returned by the second NFC device for the first request, the first please And determining to adjust a maximum length value of the data packet transmitted during the subsequent communication between the first NFC device and the second NFC device to the first length value, where the first request further includes the first DID, the first response includes a second DID;

The determining module is configured to use the first length value as a maximum length value of a data packet transmitted in a subsequent communication when the first DID is the same as the second DID.
The NFCC according to claim 19, wherein the communication module is further configured to send, to the DH, an adjustment response including a status indication and/or the first length value, the status indication being used to indicate The NFCC has adjusted the maximum length value to the first length value.
The NFCC of claim 20 wherein said NFCC further comprises an activation module, wherein:

The activation module is configured to activate the first RF interface before the communication module receives the adjustment command including the first length value sent by the DH of the first NFC device;

The communication module is further configured to send a first notification to the DH, where the first notification is used to notify the DH that the first RF interface has been activated.
The NFCC according to claim 20, wherein the determining module is further configured to: before the communication module sends the first request including the first length value to the second NFC device, The first length value is less than or equal to the second length value and less than or equal to the third length value.
The NFCC according to claim 21, wherein the communication module is further configured to receive, by using the first RF interface, a first data message sent by the DH;

The NFCC also includes a first encapsulation module, wherein:

The first encapsulating module is configured to encapsulate the load in the first data message into a first data packet by using the first length value as the maximum length value;

The communication module is further configured to send the first data packet to the second NFC device.
The NFCC according to claim 22, wherein said communication module is further used for Transmitting, to the DH, a second notification, where the second notification is used to notify that the DH second RF interface has been activated, and receiving, by using the second RF interface, the second data message sent by the DH;

The NFCC further includes a second encapsulation module, wherein:

The second encapsulating module is configured to encapsulate the load in the second data message into a second data packet by using the first length value as the maximum length value;

The communication module is further configured to send the second data packet to the second NFC device.
The NFCC according to claim 21, wherein said first request is PSL_REQ defined in the Digital specification;

The first response is a PSL_RES defined in the Digital specification;

The first RF interface is an NFC-DEP radio frequency interface defined in an NCI specification;

The first notification is RF_INTF_ACTIVATED_NTF defined in the NCI specification.
An NFCC comprising a processor and a communication device, characterized in that

The processor is configured to determine whether the NFCC is responsible for determining a maximum length value of a data packet transmitted in a subsequent communication;

The communication device is configured to: when the determination result of the processor is yes, send a first request including a first length value to the second NFC device, and receive the second NFC device to return for the first request a first response, the first request is used to indicate that a maximum length value of a data packet transmitted by the first NFC device and the second NFC device in a subsequent communication is adjusted to the first length value, where a length value is a value determined by the NFCC, the first request further includes a first DID, and the first response includes a second DID;

The processor is further configured to use, when the first DID is the same as the second DID, the first length value as a maximum length value of a data packet transmitted in a subsequent communication.
The NFCC according to claim 26, wherein said determining whether said NFCC is responsible for determining a maximum length value of a data packet transmitted in a subsequent communication comprises:

Determining whether the value of the first parameter is a first specific value, wherein the first specific value is used to indicate that a maximum length value of the data packet transmitted in the subsequent communication is determined by the N FCC, wherein the first parameter is determined by The value is the default value of the NFCC or the value assigned to the NFCC by the first NFC device DH.
The NFCC according to claim 26, wherein the communication device is further configured to send a first notification including the first length value to a DH of the first NFC device, where the first notification is used to notify the Said that the DH first RF interface has been activated;

The communication device is further configured to receive, by using the first RF interface, a data message sent by the DH;

The processor is further configured to encapsulate the load in the data message into a data packet by using the first length value as the maximum length value;

The communication device is further configured to send the data packet to the second NFC device.
The NFCC according to claim 27, wherein the communication device is further configured to send a first notification including the first length value to the DH, the first notification being used to notify the DH An RF interface has been activated;

The communication device is further configured to receive, by using the first RF interface, a data message sent by the DH;

The processor is further configured to encapsulate the load in the data message into a data packet by using the first length value as the maximum length value;

The communication device is further configured to send the data packet to the second NFC device.
The NFCC according to claim 28 or 29, wherein said first request is PSL_REQ defined in the Digital specification;

The first response is a PSL_RES defined in the Digital specification;

The first RF interface is an NFC-DEP radio frequency interface defined in an NCI specification;

The first notification is RF_INTF_ACTIVATED_NTF defined in the NCI specification.
An NFCC comprising a processor and a communication device, characterized in that

The communication device is configured to receive an adjustment command including a first length value sent by a DH of the first NFC device, where the adjustment command is used to instruct the NFCC to adjust a maximum length value of a data packet transmitted in a subsequent communication process;

The communication device is further configured to send, to the second NFC device, the first request that includes the first length value And receiving, by the second NFC device, a first response returned by the first request, where the first request is used to indicate that the first NFC device is transmitted during subsequent communication with the second NFC device The maximum length value of the data packet is adjusted to the first length value, the first request further includes a first DID, and the first response includes a second DID;

The processor is configured to use the first length value as a maximum length value of a data packet transmitted in a subsequent communication when the first DID is the same as the second DID.
The NFCC according to claim 31, wherein the communication device is further configured to send, to the DH, an adjustment response including a status indication and/or the first length value, the status indication being used to indicate The NFCC has adjusted the maximum length value to the first length value.
The NFCC according to claim 32, wherein the processor is further configured to activate the first before the communication device receives the adjustment command including the first length value sent by the DH of the first NFC device. RF interface;

The communication device is further configured to send a first notification to the DH, where the first notification is used to notify the DH that the first RF interface has been activated.
The NFCC according to claim 32, wherein said processor is further configured to determine before said communication device transmits said first request including said first length value to said second NFC device The first length value is less than or equal to the second length value and less than or equal to the third length value.
The NFCC according to claim 33, wherein the communication device is further configured to receive, by using the first RF interface, a first data message sent by the DH;

The processor is further configured to encapsulate the load in the first data message into a first data packet by using the first length value as the maximum length value;

The communication device is further configured to send the first data packet to the second NFC device.
The NFCC according to claim 34, wherein said communication device is further configured to send a second notification to said DH, said second notification being used to inform said DH that said second RF interface has been activated Live and receive the second data message sent by the DH through the second RF interface;

The processor is further configured to encapsulate the load in the second data message into a second data packet by using the first length value as the maximum length value;

The communication device is further configured to send the second data packet to the second NFC device.
The NFCC according to claim 33, wherein said first request is PSL_REQ defined in the Digital specification;

The first response is a PSL_RES defined in the Digital specification;

The first RF interface is an NFC-DEP radio frequency interface defined in an NCI specification;

The first notification is RF_INTF_ACTIVATED_NTF defined in the NCI specification.